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Complete List of United States Zip Codes | AggData
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Random Zip Codes — US City Postal Codes
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US ZIP codes are a type of postal code used within the United States to help the United States Postal Service USPS route mail more efficiently.
ZIP codes near me are shown on the map above.
Some still refer to ZIP codes as US postal codes.
The term ZIP stands for Zone Improvement Plan.
The basic 5-digit format was first introduced in 1963 and later extended to add an additional 4 digits after a dash to form a ZIP+4 code.
The additional 4 digits help USPS more precisely group mail for delivery.
Though ZIP codes were originally developed for USPS, many other shipping companies such as United Parcel Service UPSFederal Express FedExDHL, and others make use of ZIP codes for sorting packages and calculating the time and cost of shipping a package the shipping rate.
The map of the first digit of above shows they are assigned in order from the north east to the west coast.
The first 3 digits of a ZIP code determine the central mail processing facility, also called sectional center facility or "sec center", that is used to process and sort mail.
All mail with the same first 3 digits is first delivered to the same sec center where it is sorted according to the last 2 digits and distributed to local post offices.
The sec centers are not open to the public and usually do most sorting overnight.
As you can see from thethe digits after the first are also generally assigned from east to west.
In the map, 0 is closer to white and 9 is much more vivid.
It's easy to follow the gradient across each of the zones even though there are a few exceptions such as the southwest tip of Georgia which uses 39XXX like central Mississippi.
The ZIP+4 code is not required, but it aids the post office in additional sorting of mail.
A ZIP+4 code may correspond to a city block, group of apartments, or an individual high-volume receiver.
It is also common valid us cities zip codes each PO Box number to correspond to a unique ZIP+4 code.
Sometimes, several PO Box numbers are grouped into the same ZIP+4 code by using the last several digits of the PO Box number.
This method isn't a universal rule though so the ZIP+4 must still be looked up for each PO Box.
Places in the Valid us cities zip codes so Remote, They Don't Have a ZIP As you can see from the map, not everywhere in the US is assigned a ZIP code.
Remote and especially rural areas of the country do not have enough deliverable addresses to create a mail route.
Without mail delivery, a ZIP is not needed.
If you are looking to get off the grid, these areas are some of the most remote places within the country.
USA ZIP Code Boundaries Despite the fact that ZIP codes seem to be geographic in nature, that wasn't their intended purpose.
They are intended to group mail to allow the USPS to deliver mail more efficiently.
Some ZIP codes will span multiple states in order to make mail routing and delivery more efficient.
In valid us cities zip codes cases, addresses in close proximity to each other are grouped in the same ZIP code which gives the appearance that ZIP codes are defined by a clear geographic boundary.
However, some ZIP codes have nothing to do with geogaphic areas.
For instance, a single ZIP code is used for all US Navy mail.
When ZIP codes appear to be geographically grouped, a clear shape cannot always be drawn around the ZIP code because ZIP codes are only assigned to a point of delivery and not the spaces between delivery points.
In areas without a regular postal route or no mail valid us cities zip codes, ZIP codes may not be defined or have unclear boundaries.
US ZIP Code Map No official ZIP code map according to actual USPS data exists.
The main issue is discussed above: there simply isn't always a clear geographic boundary for a ZIP code.
The Census Bureau and many other commercial services will try to interpolate the data to create polygons shapes using straight lines to represent the approximate area covered by a ZIP code, but none of these maps are official or entirely accurate.
On this site, all ZIP code maps use the ZIP Code Tabulation Areas ZCTAs as specified by the United States Census Bureau in 2010 or newer and discussed below.
They provide a very close approximation of the area covered by a ZIP code.
You can easily notice some of the boundary issues when viewing our maps.
Very rural areas aren't labeled as belonging to a Https://slots-free-deposit.website/zip-code/valid-us-cities-zip-codes-1.html code such as much of and where there are few, if any, addresses to deliver mail.
If the address is on the same street as a ZIP code boundary on the map, be sure to search for the full street address to determine the ZIP code instead of relying on the map.
ZIP Code Tabulation Areas ZCTAs ZIP code tabulation areas were developed by the United States Census Bureau.
Their purpose is to convey statistical data about regions that are familiar to most citizens.
However, ZCTAs are not exactly the same as ZIP codes.
As discussed above, it is difficult to precisely define a geographic area covered by a ZIP code.
ZCTAs were developed to account for some of the difficulties in assigning an area to a ZIP code and to precisely define a geographic area.
Also, ZCTAs are not updated as frequently as ZIP codes.
In general, they are updated once every 10 years for the Census.
The Census assigns an area to a ZCTA according to census blocks the smallest geographic unit used by the census.
Imagine a city block that makes up a typical census block as pictured to the right.
It is bounded on all 4 sides by portions of city streets that each have their own name and addresses.
The issue is that census blocks almost always split down the middle of the street.
ZIP codes rarely do because that would require two postal workers delivering mail to that street - one for each side of the street.
In the example, one mail carrier may deliver to 3 sides of the block via one ZIP code while another mail carrier delivers mail on the other street in a different ZIP code.
When this happens, the Census Bureau will assign the entire block to a single ZCTA in this case, 21044 because the census block is the area that is precisely measured.
If you are getting very precise usually a matter of meters, not milescensus block boundaries near the edge of a ZIP code almost always split ZIP codes.
The statistics provided by the Census Bureau can give insight into the demographics within the ZIP code.
For instance, see our.
Matching ZIP Codes with States, Counties, and Cities Remember that ZIP codes were made to make mail delivery easier.
They weren't made to correspond to existing boundaries such as cities, counties, or even states.
If it is more efficient for a mail carrier to drive across a state line to deliver mail, the ZIP code "boundary" will cross the state lines.
ZIP codes don't usually cross state lines, but some do 65733, 71749, and 73949 are good examples.
It gets even more complicated when trying to assign a ZIP code to a specific county as much as 25% cross county linescongressional district, metro area, time zone, area code, etc.
The edges of the boundaries commonly overlap.
For the purposes of our downloads, we will commonly list either the most common region for the ZIP code or list multiple regions if several exist in the ZIP code.
For cities, the assignment is somewhat more complicated.
USPS does not always use the city in which the ZIP code is located.
The assignment of cities to ZIP codes is more general.
The city is usually the name of the main post office.
For instance, almost all ZIP codes in St.
Louis County in Missouri have a city of Saint Louis when they may be more accurately described as the name of a smaller city where they are located.
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Complete List of United States Zip Codes | AggData
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Random Zip Codes — US City Postal Codes
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We've been providing data to our clients for years and over 225,000 different individuals, organizations, and corporations of all sizes have trusted us to provide them with the high quality data that they need.
We don't just tell you about the quality, we show you the results of our verification and research see below and make sure you can quickly understand the most accurate ways to use the data we provide.
All data is consistently labeled, there are no duplicates, quality data sources minimize any inaccuracies, and multiple data sources verify accuracy.
We've done the work to combine data from multiple sources to make sure you have all of the fields you need.
Plus, we haven't included dozens of fields that you will never use and only slow you down.
Is your data up-to-date?
Update when you want.
If you can find any major changes before we make data updates, we'll issue a full refund.
Instead of locking our users into a recurring fee, we let you decide when updates are significant enough to warrant the time and cost of updating.
We also don't issue data updates for insignificant changes like updating a ZIP to show it has 3869 deliverable addresses instead of 3866.
Because it can take up to 5 years for people to fully utilize a ZIP, ZIP changes are minimized and a 10 year old data set would still contain 99% of currently active 5 digit ZIP codes.
Even so, when evaluating how often you want to update your data, keep in mind that many pieces of information about a ZIP code can be updated over time.
We recommend you update your list between once every year and once every 5 years depending on your data needs.
We've included the number of new ZIP codes added each year to assist you in making your decision.
How often are new ZIP codes created?
How many new ZIP codes are created every year?
It is typical for 10-20 new ZIP codes to be created each year.
How often often are zip codes changed?
What changes are there for zip codes?
Most of the information that changes about a ZIP code is related to the ZIP+4 the last 4 digits after the primary 5 digit ZIP code or the number of deliverable addresses.
Neither are included in the ZIP code database so updates can be less frequent.
The demographics of a ZIP can change over time so we issue frequent updates for statistics.
Are zip codes ever removed?
Are zip codes ever deleted from use?
Over 500 ZIP codes have been decomissioned as post offices close or the needs of the United States Postal Service change.
Tax Returns Filed for ZIPs Introduced in 2008 Over half of residents filed their tax return using a new ZIP code the first year it was introduced, but it can take up to 5 years for a ZIP to become fully active.
For example, you are allowed to make copies for backups as long as those backups are not publicly available.
You may also make copies for each workstation for each employee.
You may not make the data set publicly available for download over the internet or distribute the complete data set as part of an application provided to customers.
However, you may use on public networks such as the internet if used within a lookup application such as a "nearest store lookup" where the data set is not distributed to end users.
If you would like to redistribute the data or have a question about acceptable usage, please for further clarification and pricing options.
Quick ZIP Lookup and Data Analyzer Our spreadsheets now include an easy option to look up the statistics for select ZIPs.
Watch the demo of how you can combine the with our ZIP code spreadsheet to quickly lookup dozens of statistics for the ZIP codes that you have selected.
Plus, there is no ongoing fee.
Requires Excel 2007 or newer versions that open XLSX documents.
Counts households instead of the number of buildings ie.
However, we realize that there are many other uses for this data set so we have included lists of other cities that are recognized by USPS.
Acceptable cities are recognized by the USPS and should not result in delivery delays.
As you will learn below, certain geographic areas are frequently referred to by multiple names.
The boundaries of a ZIP code generally have nothing to do with city limits.
ZIP boundaries are set to aid mail delivery.
As a result, the USPS may refer to an area by a name which may be inside an incorporated city's city limits that uses another name and still have other names that are used in common conversation.
The list of unaccpetable cities may be fine for everyday conversation.
However, using them when addressing mail will likely result in delivery delays.
ZIP Code Boundaries Do Not Match City Limits One of the most frequent questions we get is related to matching ZIPs to cities.
Remember that the boundaries of a ZIP code generally have nothing to do with city limits.
ZIP boundaries are set to aid mail delivery.
City limits are not.
Generally, USPS determines a mail route that best suites their needs, they assign a ZIP to that area, and they name the "city" of the ZIP after the post office s in that ZIP.
As you can see from the example image, about the only time the city limits and ZIP boundaries match up are across state lines and that isn't even universally true.
Many ZIPs cross state boundaries.
Think of it this way: if the postal carrier is driving down a road delivering mail and happens to cross the city limits, it makes little sense to have them stop delivering for the rest of the houses on the street simply because the city limits changed.
Instead, they'll keep delivering along the street to the next intersection or some other boundary that makes more sense to allocating their available resources, i.
ZIP "Cities" Often Aren't Incorporated Cities Futher, USPS does not always use the name of the incorporated city in which the ZIP code is located.
The assignment of cities to ZIP codes is more general.
The city is usually the name of the main post office.
The image example of New York, NY illustrates this point.
The black outline shows the area of the official city limits.
Every color coded region within is a different ZIP code.
ZIPs with the same city according to USPS have the same color.
To avoid overcrowding, only a few labels are shown.
As you can see, the area inside New York city is actually split into many ZIP codes that are each named after different places.
Staten Island, Brooklyn, valid us cities zip codes Bronx are all famous parts of NYC that can easily be picked out in the example.
None of them are actually an incorporated city.
However, USPS uses those names to indicate the city for the ZIP codes located in those areas.
Because the area is so densely populated, many different areas within NYC are given names that are not "New York.
ZIP Codes Include Rural Areas Explanation Remember that people in rural areas outside of city limits still need to receive mail.
So, ZIP codes cover a much larger portion of the land area in the US than city limits.
This coverage is easily seen in the image examples shown for the area around Memphis, TN.
One map shows the color coded areas that make up the official city limits for the various cities in the region.
The second map shows all ZIP codes with the same primary city shaded using the same color.
Notice how many rural areas are grouped with nearby cities because they share delivery resources.
Correctly Matching ZIPs to Cities and Counties To solve these issues, we have compiled the overlap data between ZIP codes and cities as well as ZIP codes and counties.
We analyzed every block that the Census Bureau assigned within the U.
This means that you can determine what percentage of the population of a ZIP code is located within various city limits without complex analysis of tons of addresses, shapes, or areas.
We list the overlap based on area, land area, population, and number of households to suit various use cases.
You get two overlaps as percentages: percentage of the ZIP in an area and the percentage of the area in the ZIP.
To facilitate easier matching, various identifiers of cities and counties are included such as FIPS and ANSI codes.
For instance, DC can be represented as "Washington, DC", "Washington D.
However, it will always have an FIPS code of 11.
As another example, St.
Louis, MO could be spelled as "St Louis", "St.
Louis", or "Saint Louis" in various data sets.
Keep in mind that there may be multiple rows in the data set for a single ZIP - for instance when a ZIP overlaps 2 counties, there will be two rows for that ZIP.
Note that not all ZIP codes, cities, or counties will be included in this data file.
Only the ZIPs that are studied by the Census Bureau that are geographically based approximately 33,000 are included.
Approximately 98% of counties and 95% of cities overlap with a ZIP code and are included.
There is inherently some loss in precision.
For example, the Navy may use a ZIP for several aircraft carriers.
Please take the above into consideration when choosing which set of coordinates to use.
Each can be useful in different types of situations.
Approximate Coordinates Green The approximate latitude and longitude coordinates from the National Weather Service that are rounded to 2 decimal places should be sufficient for many use cases.
Remember that a ZIP code often covers a large geographic area and that very precise latitude and longitude coordinates may be precise down to a very small radius - down to very small fractions of a mile which is much smaller than the geographic area covered by a ZIP code.
Changing the latitude or longitude coordinate by a single hundredth of a decimal place results in a shift of approximately 1 mile in any direction.
The radius of this shift is shown in the graphic in green.
As you can see, the lack of precision due to rounding to two decimal places is insignificant when compared to the reduction in precision caused by reducing a complex shape to a single point.
Many of these coordinates have been hand chosen.
The lack of additional digits after the decimal serves as a reminder to keep precision in mind when performing any calculations.
This method is shown in the example graphic in red.
As you can see, this can result in coordinates that do not actually lie within the region covered by the ZIP code.
The point chosen using this method is actually located within a small area that is not covered by the ZIP code.
Using this calculation method will result in a point outside of the ZIP code approximately 8% of the time.
Internal Point Coordinates The internal points are calculated by the.
They use a method similar to the bounding box method.
However, should a coordinate lie outside of the ZIP, as it does in the ZIP pictured, the coordinates will be shifted to the nearest internal point or internal point within land.
Polygon Offset Coordinates Black Another method for calculating the ZIP coordinates involves complex shape analysis of the polygon that represents the ZIP code called polygon offsetting or polygon buffering.
The result is a coordinate that will be within the largest section of the ZIP code.
This method is quite well suited to label positioning and is actually how the labels positions are determined on maps throughout the site.
As you can see from the image where this method is shown in black, this may be significantly different from the other two calculation methods.
It can also result in a point that is a much more significant distance from some sections of the ZIP code.
For instance, the example has a point that is very far from the south west portion of the ZIP.
Population Center Coordinates While the Census Bureau publishes centers of population for many different geographic areas of the country ex.
We use to calculate the population mean center.
As discussed in their analysis, the population mean center is frequently preferred over the population median center because it responds to more slight changes in population.
Realize that the population center of a ZIP code may actually lie outside the boundary of the ZIP code just as the bounding box coordinates do.
However, this occurrence should be rare.
Less than 3% of ZIP codes have a population center that lies outside of the boundary of the ZIP.
Coverage The approximate coordinates that are a combination of hand-picked coordinates and those from the National Weather Service NWS cover over 98% of all active and decomissioned ZIP codes - more than most of our competitors that only provide coordinates calculated by the Census Bureau.
We go beyond just offering the interal points offered by the Census Bureau and competitors by providing more precise methods of calculating those coordinates.
Because all of the coordinate calculation methods other than the National Weather Service data rely on Census data, those coordinates are only available for the ZIP codes included by the Census Bureau.
The Census Bureau researched 33,120 of the approximately 42,000 currently active ZIP codes.
While that may seem like a large discrepancy, you can see from the chart that over 93% of those ZIPs without Census data are for single buildings or military usage where an approximation is more than adequate.
For these reasons, any of the methods for calculating coordinates should suffice for the majority of the population.
However, we recommend you fall back to using the approximate coordinates from the National Weather Service in the case that you need coordinates for specific ZIPs other than the most commonly used ones.
Mileage Differences For most ZIP codes, the difference in coordinate calculation methods equates to a few miles.
However, for some, the choice of coordinates can make as much as a 20 or 30 mile difference.
Take ZIP code 71373 for instance.
A Comparison of ZIP Code Population Estimates A Brief Overview: Why not use the most recent data?
Our Recommendation: Unless you have a very specific need for comparing data to a single year, the 2010 Census data likely provides a more accurate estimate of current population levels than the more recent but less accurate estimates from the IRS and less precise estimates of the ACS.
Over a 5 year period, the U.
That leaves an extremely small amount of room for error.
Another way to approximate the population is to use sampling.
The answers such as the number of people in the household help to estimate the population as a whole.
To get those huge savings, only a small percentage of the population is surveyed which leaves us valid us cities zip codes a range the population likely falls within instead of a precise number.
The margin of error that determines the size of the range is larger than the expected population growth.
Another way to approximate the population is to use an estimator.
As confirmed by the Internal Revenue Service IRSthe number of tax returns filed for a ZIP code can be used to approximate the number of households and the number of exemptions can be used to approximate the population.
However, as an estimator, it isn't perfect.
As discussed below, it is affected by economic changes as well as tax policy changes.
It also has strict privacy limits on data release such that it underestimates the population by more than the expected population growth.
Coverage: 3-Way Tie The 2010 Census was done precisely to estimate population sizes and so provides estimates for the most ZIP codes.
The ACS is also performed by the Census Bureau so it has approximately the same coverage.
Of the remaining ZIPs not included in 1 and 2 above that are omitted by the IRS, nearly 95% have a population under 500.
Other estimates for ZIPs with a very low population should be valid us cities zip codes with skepticism because the IRS data implements other privacy protection measures.
Readers should notice that the ZIP codes omitted from the IRS data set only account for around 2% of the total population so this is by no means a major issue.
ZIPs Omitted from IRS Estimates by Population Size As you can see most ZIPs omitted from the IRS data also have low population estimates from the Census Bureau.
In fact, over 1200 of the missing ZIPs are estimated to have a population of less than 100 people.
Accuracy Issues: IRS Improvements to 2010 Census Accuracy The largest objection to the census data is that it tabulates population based on ZIP Code Tabulation Area ZCTA as opposed to actual ZIP code.
Read more about the on our home page.
In response, the Census Bureau made significant changes in 2010 to how ZCTAs are tabulated.
For 2010 only legitimate five-digit areas are defined so there is no longer full nation-wide coverage.
The 2010 ZCTAs will better represent the actual Zip Code service areas because the Census Bureau initiated a process before creation of 2010 blocks to add block boundaries that split polygons with large numbers of addresses using different ZIP Codes.
The USPS makes periodic changes to ZIP Codes to support more efficient mail delivery.
The Code Tabulation Areas process used primarily residential addresses and was biased towards ZIP Codes used for city-style mail delivery, thus there may be ZIP Codes that are primarily nonresidential or boxes only that may not have a corresponding ZCTA.
Census Bureau Exemptions Aren't a Perfect Estimator The first issue with the accuracy of the IRS estimates is that their are using exemptions as an estimator for populations as opposed to directly trying to calculate population size.
Because it is only an estimator, it is still subject to variation due to other variables.
For instance, economic changes or changes in tax policy are likely to affect the population estimates.
It is highly unlikely that the population shrank by 5% in 2008.
It is much more likely that the economic downturn affected the estimates by changing how the population files their tax returns.
While other competitors that offer a free download with IRS data have suggested using the formula of "returns + joint returns + dependents" to estimate population size, the Valid us cities zip codes suggests using the number of exemptions.
Our research backs up the valid us cities zip codes put forth by the IRS.
Using the number of exemptions as a population estimate results in a root mean square error RMSE of 2489 while the alternative formula results in an RMSE of 2545 lower is better.
In general, the IRS underestimates the population of a ZIP as compared to ZCTAs by 10% to 20% for two reason.
Both of which are documented by the IRS.
The IRS documents only around 289 million exemptions compared to a population of 312 million estimated by the Census.
While 289 million exemptions are reported when examining state level data that is not subject to privacy protection, only 277 million are reported after privacy protection eliminates some data.
Margins Are Higher Than Expected Population Change The graph below shows the number of ZIPs by the margin of error as a percentage of the population.
Surveying a large portion of the population is expensive especially with the large number of questions besides population included in the ACS.
The Census Bureau publishes population estimates based on ACS surveys using data from the past 1 year, 3 years, or 5 years of data.
Including data from more years increases the sample size to improve the precision of the estimate at the cost of using less recent data.
We include the estimates based on the past 5 years worth of surveys because they are based on the largest sample to provide the most precise estimates.
Even so, the ACS only samples approximately 10% of the population over a 5 year period.
Recall that the population of the country is expected to change by less than 5% over a 5 year period and the population of any given ZIP is likely to change by less than 10%.
The easiest way to think about this is that it is difficult to provide an estimate with only a 5%-10% margin of error based on only surveying 10% of the population.
As you can see from the graph, the margin of error is 10% or more for over half of the ZIP codes - which is higher than the estimated population change.
To further illustrate this point, the 2010 Census population is within the most recent ACS margin of error for nearly 75% of ZIPs.
So, by choosing the ACS estimates over the Census, the population estimate would improve for 25% of ZIPs while becoming less accurate for nearly 75%.
We have included the margin of error with the ACS estimates so that those looking to create their own estimate can make their own judgement calls as to their formula for estimating the population for a given ZIP.
For those diving deeper into population estimates, we have examined whether the IRS and ACS estimates show the same relative change in population over various periods of time.
In other words, we valid us cities zip codes this question: if the IRS estimates that the population of a ZIP increased over a certain period of time, does the ACS data also indicate a population increase?
We have found that there is a correlation between the two data sets.
However, that correlation only becomes apparent on estimates for ZIPs that have a very low margin of error.
You have indicated that you intend to use the data for a commercial purpose.
Census Bureau, Yahoo, Google, FedEx, and UPS.

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Generate a fake United States address complete with street, city, state, zip codes. Be careful though: some of these could end up being real addresses.


Enjoy!
U.S. ZIP Code Database List (5 Digit ZIP Codes)
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ZIP Code Database - ZIP Code List
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Comments
We've been providing data to our clients for years and over 225,000 different individuals, organizations, and corporations of all sizes have trusted us to provide them with the high quality data that they need.
We don't just tell you about the quality, we show you the results of our verification and research see below and make sure you can quickly understand the most accurate ways to use the data we provide.
All data is consistently labeled, there are no duplicates, quality data sources minimize any inaccuracies, and multiple data sources verify accuracy.
We've done the work to combine data from multiple sources to make sure you have all of the fields you need.
Plus, we haven't included dozens of fields that you will never use and only slow you down.
Is your data up-to-date?
Update when you want.
If you can find any major changes before we make data updates, we'll issue a full refund.
Instead of locking our users into a recurring fee, we let you decide when updates are significant enough to warrant the time and cost of updating.
We also don't issue data updates for insignificant changes like updating a ZIP to show it has 3869 deliverable addresses instead of 3866.
Because it can take up to 5 years for people to fully utilize a ZIP, ZIP changes are minimized and a 10 year old data set would still contain 99% of currently active 5 digit ZIP codes.
Even so, when evaluating how often you want to update your data, keep in valid us cities zip codes that many pieces of information about a ZIP code can be updated over time.
We recommend you update your list between once every year and once every 5 valid us cities zip codes depending on your data needs.
We've included the number of new ZIP codes added each year to assist you in making your decision.
How often are new ZIP codes created?
How many new ZIP codes are created every year?
It is typical for 10-20 new ZIP codes to be created each year.
How often often are zip codes changed?
What changes are there for zip codes?
Most of the information that changes about a ZIP code is related to the ZIP+4 the last 4 digits after the primary 5 digit ZIP code or the number of deliverable addresses.
Neither are included in the ZIP code database so updates can be less frequent.
The demographics of a ZIP can change over time so we issue frequent updates for statistics.
Are zip codes ever removed?
Are zip codes ever deleted from use?
Over 500 ZIP codes have been decomissioned as post offices close or the needs of the United States Postal Service change.
Tax Returns Filed for ZIPs Introduced in 2008 Over half of residents filed their tax return using a new ZIP code the first year it was introduced, but it can take up to 5 years for a ZIP to become fully active.
For example, you are allowed to make copies for backups as long as those backups are not publicly available.
You may also make copies for each workstation for each employee.
You may not make the data set publicly available for download over the internet or distribute the complete data set as part of an application provided to customers.
However, you may use on public networks such as the internet if used within a lookup application such as a "nearest store lookup" where the data set is not distributed to end users.
If you would like to redistribute the data or have a question about acceptable usage, please for further clarification and pricing options.
Quick ZIP Lookup and Data Analyzer Our spreadsheets now include an easy option to look up the statistics for select ZIPs.
Watch the demo of how you can combine the with our ZIP code spreadsheet to quickly lookup dozens of statistics for the ZIP codes that you have selected.
Plus, there is no ongoing fee.
Requires Excel 2007 or newer versions that open XLSX documents.
Counts households instead of the number of buildings ie.
However, we realize that there are many other uses for this data set so we have included lists of other cities that are recognized by USPS.
Acceptable cities are recognized by the USPS and should not result in delivery delays.
As you will learn below, certain geographic areas are frequently referred to by multiple names.
The boundaries of a ZIP code generally have nothing to do with city limits.
ZIP boundaries are set to aid mail delivery.
As a result, the USPS may refer to an area by a name which may be inside an incorporated city's city limits that uses another name and still have other names that are used in common conversation.
The list of unaccpetable cities may be fine for everyday conversation.
However, using them when addressing mail will likely result in delivery delays.
ZIP Code Boundaries Do Not Match City Limits One of the most frequent questions we get is related to matching ZIPs to cities.
Remember that the boundaries of a ZIP code generally have nothing to do with city limits.
ZIP boundaries are set to aid mail delivery.
City limits are not.
Generally, USPS determines a mail route that best suites their needs, they assign a ZIP to that area, and they name the "city" of the ZIP after the post office s in that ZIP.
As you can see from the example image, about the only time the city limits and ZIP boundaries match up are across state lines and that isn't even universally true.
Many ZIPs cross state boundaries.
Think of it this way: if the postal carrier is driving down a road delivering mail and happens to cross the city limits, it makes little sense to have them stop delivering for the rest of the houses on the street simply because the city limits changed.
Instead, they'll keep delivering along the street to the next intersection or some other boundary that makes more sense to allocating their available resources, i.
ZIP "Cities" Often Aren't Incorporated Cities Futher, USPS does not always use the name of the incorporated city in which the ZIP code is located.
The assignment of cities to ZIP codes is more general.
The city is usually the name of the main post office.
The image example of New York, NY illustrates this point.
The black outline shows the area of the official city limits.
Every color coded region within is a different ZIP code.
ZIPs with the same city according to USPS have the same color.
To avoid overcrowding, only a few labels are shown.
As you can see, the area inside New York city is actually split into many ZIP codes that are each named after different places.
Staten Island, Brooklyn, and Bronx are all famous parts of NYC that can easily be picked out in the example.
None of them are actually an incorporated city.
However, USPS uses those names to indicate the city for the ZIP codes located in those areas.
Because the area is so densely populated, many different areas within NYC are given names that are not "New York.
ZIP Codes Include Rural Areas Explanation Remember that people in rural areas outside of city limits still need to receive mail.
So, ZIP codes cover a much larger portion of the land area in the US than city limits.
This coverage is easily seen in the image examples shown for the area around Memphis, TN.
One map shows the color coded areas that make up the official city limits for the various cities in the region.
The second map shows all ZIP codes with the same primary city shaded using the same color.
Notice how many rural areas are grouped with nearby cities because they share delivery resources.
Correctly Matching ZIPs to Cities and Counties To solve these issues, we have compiled the overlap data between ZIP codes and cities as well as ZIP codes and counties.
We analyzed every block that the Census Bureau assigned within the U.
This means that you can determine what percentage of the population of a ZIP code is located within various city limits without complex analysis of tons of addresses, shapes, or areas.
We list the overlap based on area, land area, population, and number of households to suit various use cases.
You get two overlaps as percentages: percentage of the ZIP in an area and the percentage of the area in the ZIP.
To facilitate easier matching, various identifiers of cities and counties are included such as FIPS and ANSI codes.
For instance, DC can be represented as "Washington, DC", "Washington D.
However, it will always have an FIPS code of 11.
As another example, St.
Louis, MO could be spelled as "St Louis", "St.
Louis", or "Saint Louis" in various data sets.
Keep in mind that there may be multiple rows in the data set for a single ZIP - for instance when a ZIP overlaps 2 counties, there will be two rows for that ZIP.
Note that not all ZIP codes, cities, or counties will be included in this data file.
Only the ZIPs that are studied by the Census Bureau that are geographically based approximately 33,000 are included.
Approximately 98% of counties and 95% of cities overlap with a ZIP code and are included.
There is inherently some loss in precision.
For example, the Navy may use a ZIP for several aircraft carriers.
Please take the above into consideration when choosing which set of coordinates to use.
Each can be useful in different types of situations.
Approximate Coordinates Green The approximate latitude and longitude coordinates from the National Weather Service that are rounded to 2 decimal places should be sufficient for many use cases.
Remember that a ZIP code often covers a large geographic area and that very precise latitude and longitude coordinates may be precise down to a very small radius - down to very small fractions of a mile which is much smaller than the geographic area covered by a ZIP code.
Changing the latitude or longitude coordinate by a single hundredth of a decimal place results in a shift of approximately 1 mile in any direction.
The radius of this shift is shown in the graphic in green.
As you can see, the lack of precision due to rounding to two decimal places is insignificant when compared to the reduction in precision caused by reducing a complex shape to a single point.
Many of these coordinates have been hand chosen.
The lack of additional digits after the decimal serves as a reminder to keep precision in mind when performing any calculations.
This method is shown in the example graphic in red.
As you can see, this can result in coordinates that do not actually lie within the region covered by the ZIP code.
The point chosen using this method is actually located within a small area that is not covered by the ZIP code.
Using this calculation method will result in a point outside of the ZIP code approximately 8% of the time.
Internal Point Coordinates The internal points are calculated by the.
They use a method similar to the bounding box method.
However, should a coordinate lie outside of the ZIP, as it does in the ZIP pictured, the coordinates will be shifted to the nearest internal point or internal point within land.
Polygon Offset Coordinates Black Another method for calculating the ZIP coordinates involves complex shape analysis of the polygon that represents the ZIP code called polygon offsetting or polygon buffering.
The result is a coordinate that will be within the largest section of the ZIP code.
This method is quite well suited to label positioning and is actually how the labels positions are determined on maps throughout the site.
As you can see from the image where this method is shown in black, this may be significantly different from the other two calculation methods.
It can also result in a point that is a much more significant distance from some sections of the ZIP code.
For instance, the example has a point that is very far from the south west portion of the ZIP.
Population Center Coordinates While the Census Bureau publishes centers of population for many different geographic areas of the country ex.
We use to calculate the population mean center.
As discussed in their analysis, the population mean center is frequently preferred over the population median center because it responds to more slight changes in population.
Realize that the population center of a ZIP code may actually lie outside the boundary of the ZIP code valid us cities zip codes as the bounding box coordinates do.
However, this occurrence should be rare.
Less than 3% of ZIP codes have a population center that lies outside of the boundary of the ZIP.
Coverage The approximate coordinates that are a combination of hand-picked coordinates and those from the National Weather Service NWS cover over 98% of all active and decomissioned ZIP codes - more than most of our competitors that only provide coordinates calculated by the Census Bureau.
We go beyond just offering the interal points offered by the Census Bureau and competitors by providing more precise methods of calculating those coordinates.
Because all of the coordinate calculation methods other than the National Weather Service data rely on Census data, those coordinates are only available for the ZIP codes included by the Census Bureau.
The Census Bureau researched 33,120 of the approximately 42,000 currently active ZIP codes.
While that may seem like a large discrepancy, you can see from the chart that over 93% of those ZIPs without Census data are for single buildings or military usage where an approximation is more than adequate.
For these reasons, any of the methods for calculating coordinates should suffice for the majority of the population.
However, we recommend you fall back to using the approximate coordinates from the National Weather Service in the case that you need coordinates for specific ZIPs other than the most commonly used ones.
Mileage Differences For most ZIP codes, the difference in coordinate calculation methods equates to a few miles.
However, for some, the choice of coordinates can make as much as a 20 or 30 mile difference.
Take ZIP code 71373 for instance.
A Comparison of ZIP Code Population Estimates A Brief Overview: Why not use the most recent data?
Our Recommendation: Unless you have a very specific need for comparing data to a single year, the 2010 Census data likely provides a more accurate estimate of current population levels than the more recent but less accurate estimates from the IRS and less precise estimates of the ACS.
Over a valid us cities zip codes year period, the U.
That leaves an extremely small amount of room for error.
Another way to approximate the population is to use sampling.
The answers such as the number of people in the household help to estimate the population as a whole.
To get those huge savings, only a small percentage of the population is surveyed which leaves us with a range the population likely falls within instead of a precise number.
The margin of error that determines the size of the range is larger than the expected population growth.
Another way to approximate the population is to use an estimator.
As confirmed by the Internal Revenue Service IRSthe number of tax returns filed for a ZIP code can be used to valid cities zip codes the number of households and the number of exemptions can be used to approximate the population.
However, as an estimator, it isn't perfect.
As discussed below, it is affected by economic changes as well as tax policy changes.
It also has strict privacy limits on data release such that it underestimates the population by more than the expected population growth.
Coverage: 3-Way Tie The 2010 Census was done precisely to estimate population sizes and so provides estimates for the most ZIP codes.
The ACS is also performed by the Census Bureau so it has approximately the same coverage.
Of the remaining ZIPs not included in 1 and 2 above that are omitted by the IRS, nearly 95% have a population under 500.
Other estimates for ZIPs with a very low population should be viewed with skepticism because the IRS data implements other privacy protection measures.
Readers should notice that the ZIP codes omitted from the IRS data set only account for around 2% of the total population so this is by no means a major issue.
ZIPs Omitted from IRS Estimates by Population Size As you can see most ZIPs omitted from the IRS data also have low population estimates from the Census Bureau.
In fact, over 1200 of the missing ZIPs are estimated to have a population of less than 100 people.
Accuracy Issues: IRS Improvements to 2010 Census Accuracy The largest objection to the census data is that valid us cities zip codes tabulates population based on ZIP Code Tabulation Area ZCTA as opposed to actual ZIP code.
Read more about the on our home page.
In response, the Census Bureau made significant changes in 2010 to how ZCTAs are tabulated.
For 2010 only legitimate five-digit areas are defined so there is no longer full nation-wide coverage.
The 2010 ZCTAs will better represent the actual Zip Code service areas because the Census Bureau initiated a process before creation of 2010 blocks to add block boundaries that split polygons with large numbers of addresses using different ZIP Codes.
The USPS makes periodic changes to ZIP Codes to support more efficient mail delivery.
The Code Tabulation Areas process used primarily residential addresses and was biased towards ZIP Codes used for city-style mail delivery, thus there may be ZIP Codes that are primarily nonresidential or boxes only that may not have a corresponding ZCTA.
Census Bureau Exemptions Aren't a Perfect Estimator The first issue with the accuracy of the IRS estimates is that their are using exemptions as an estimator for populations as opposed to directly trying to calculate population size.
Because it is only an estimator, it is still subject to variation due to other variables.
For instance, economic changes or changes in tax policy are likely to affect the population estimates.
It is highly unlikely that the population shrank by 5% in 2008.
It is much more likely that the economic downturn affected the estimates by changing how the population files their tax returns.
While other competitors that offer a free download with IRS data have suggested using the formula of "returns + joint returns + dependents" to estimate population size, the IRS suggests using the number of exemptions.
Our research backs up the suggestions put forth by the IRS.
Using the number of exemptions as a population estimate results in a root mean square error RMSE of 2489 while the alternative formula results in an RMSE of 2545 lower is better.
In general, the IRS underestimates the population of a ZIP as compared to ZCTAs by 10% to 20% for two reason.
Both of which are documented by the IRS.
The IRS documents only around 289 million exemptions compared to a population of 312 million estimated by the Census.
While 289 million exemptions are reported when examining state level data that is not subject to privacy protection, only 277 million are reported after privacy protection eliminates some data.
Margins Are Higher Than Expected Population Change The graph below shows the number of ZIPs by the margin of error as a percentage of the population.
Surveying a large portion of the population is expensive especially with the large number of questions besides population included in the ACS.
The Census Bureau publishes population estimates based on ACS surveys using data from the past 1 year, 3 years, or 5 years of data.
Including data from more years increases the sample size to improve the precision of the estimate at the cost of using less recent data.
We include the estimates based on the past 5 years worth of surveys because they are based on the largest sample to provide the most precise estimates.
Even so, the ACS only samples approximately 10% of the population over a 5 year period.
Recall that the population of the country is expected to change by less than 5% over a 5 year period and the population of any given ZIP is likely to change by less than 10%.
The easiest way to think about this is that it is difficult to provide an estimate with only a 5%-10% margin of error based on only surveying 10% of the population.
As you can see from the graph, the margin of error is 10% or more for over half of the ZIP codes - which is higher than the estimated population change.
To further illustrate this point, the 2010 Census population is within the most recent ACS margin of error for nearly 75% of ZIPs.
So, by choosing the ACS estimates over the Census, the population estimate would improve for 25% of ZIPs while becoming less accurate for nearly 75%.
We have included the margin of error with the ACS estimates so that those looking to create their own estimate can make their own judgement calls as to their formula for estimating the population for a given ZIP.
For those diving deeper into population estimates, we have examined whether the IRS and ACS estimates show the same relative change in population over various periods of time.
In other words, we asked this question: if the IRS estimates that the population of a ZIP increased over a certain period of time, does the ACS data also indicate a population increase?
We have found that there is a correlation between the two data sets.
However, that correlation only becomes apparent on estimates for ZIPs that have a very low margin of error.
You have indicated that you intend to use the data for a commercial purpose.
Census Bureau, Yahoo, Google, FedEx, and UPS.

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F.Y.I. ZIP is an acronym for Zone Improvement Plan. A ZIP Code is a 5-digit code that identifies a specific geographic delivery area. ZIP Codes can represent an area within a state (an area that may or may not cross county boundaries), an area that crosses state boundaries (an unusual condition), or a single building or company that has a very high mail volume.


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This is a list of all zip codes in the United States, along with additional information such as the state, county, and geographic coordinates. Source from Geonames.org


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A ZIP Code is a 5-digit code that identifies a specific geographic delivery area. ZIP Codes can represent an area within a state (an area that may or may not cross county boundaries), an area that crosses state boundaries (an unusual condition), or a single building or company that has a very high mail volume.


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We've been providing data to our clients for years and over 225,000 different individuals, organizations, and corporations of all sizes have trusted us to provide them with the high quality data that they need.
We don't just tell you about the quality, we show you the results of our verification and research see below and make sure you can quickly understand the most accurate ways to use the data we provide.
All data is consistently labeled, there are no duplicates, quality data sources minimize any inaccuracies, and multiple data sources verify accuracy.
We've done the work to combine data from multiple sources to make sure you have all of the fields you need.
Plus, we haven't included dozens of fields that you will never use and only slow you down.
Is your data up-to-date?
Update when you want.
If you can find any major changes before we make data updates, we'll issue a full refund.
Instead of locking our users into a recurring fee, we let you decide when updates are significant enough to warrant the time and cost of updating.
We also don't issue data updates for insignificant changes like updating a ZIP to show it has 3869 deliverable addresses instead of 3866.
Because it can take up to 5 years for people to fully utilize a ZIP, ZIP changes are minimized and a 10 year old data set would still contain 99% of currently active 5 digit ZIP codes.
Even so, when evaluating how often you want to update your data, keep in mind that many pieces of information about a ZIP code can be updated over time.
We recommend you update your list between once every year and once every 5 years depending on your data needs.
We've included the number of new ZIP codes added each year to assist you in making your decision.
How often are new ZIP codes created?
How many new ZIP codes are created every year?
It is typical for 10-20 new ZIP codes to be created each year.
How often often are zip codes changed?
What changes are there for zip codes?
Most of the information that changes about a ZIP code is related to the ZIP+4 the last 4 digits after the primary 5 digit ZIP code or the number of deliverable addresses.
Neither are included in the ZIP code database so updates can be less frequent.
The demographics of a ZIP can change over time so we issue frequent updates for statistics.
Are zip codes ever removed?
Are zip codes ever deleted from use?
Over 500 ZIP codes have been decomissioned as post offices close or the needs of the United States Postal Service change.
Tax Returns Filed for ZIPs Introduced in 2008 Over half of residents filed their tax return using a new ZIP code the first year it was introduced, but it can take up to 5 years for a ZIP to become fully active.
For example, you are allowed to make copies for backups as long as those backups are not publicly available.
You may also make copies for each workstation for each employee.
You may not make the data set publicly available for download over the internet or distribute the complete data set as part of an application provided to customers.
However, you may use on public networks such as the internet if used within a lookup application such as a "nearest store lookup" where the data set is not distributed to end users.
If you would like to redistribute the data or have a question about acceptable usage, please for further clarification and pricing options.
Quick ZIP Lookup and Data Analyzer Our spreadsheets now include an easy option to look up the statistics for select ZIPs.
Watch the demo of how you can combine the with our ZIP code spreadsheet to quickly lookup dozens of statistics for the ZIP codes that you have selected.
Plus, there is no ongoing fee.
Requires Excel 2007 or newer versions that open XLSX documents.
Counts households instead of the number of buildings ie.
However, we realize that there are many other uses for this data set so we have included lists of other cities that are recognized by USPS.
Acceptable cities are recognized by the USPS and should not result in delivery delays.
As you will learn below, certain geographic areas are frequently referred to by multiple names.
The boundaries of a ZIP code generally have nothing to do with city limits.
ZIP boundaries are set to aid mail delivery.
As a result, the USPS may refer to an area by a name which may be inside an incorporated city's city limits that uses another name and still have other names that are used in common conversation.
The list of unaccpetable cities may be fine for everyday conversation.
However, using them when addressing mail will likely result in delivery delays.
ZIP Code Boundaries Do Not Match City Limits One of the most frequent questions we get is related to matching ZIPs to cities.
Remember that the boundaries of a ZIP code generally have nothing to do with city limits.
ZIP boundaries are set to aid mail delivery.
City limits are not.
Generally, USPS determines a mail route that best suites their needs, they assign a ZIP to that area, and they name the "city" of the ZIP after the post office s in that ZIP.
As you can see from the example image, about the only time the city limits and ZIP boundaries match up are across state lines and that isn't even universally true.
Many ZIPs cross state boundaries.
Think of it this way: if the postal carrier is driving down a road delivering mail and happens to cross the city limits, it makes little sense to have them stop delivering for the rest of the houses on the street simply because the city limits changed.
Instead, they'll keep delivering along the street to the next intersection or some other boundary that makes more sense to allocating their available resources, i.
ZIP "Cities" Often Aren't Incorporated Cities Futher, USPS does not always use the name of the incorporated city in which the ZIP code is located.
The assignment of cities to ZIP codes is more general.
The city is usually the name of the main post office.
The image example of New York, NY illustrates this point.
The black outline shows the area of the official city limits.
Every color coded region within is a different ZIP code.
ZIPs with the same city according to USPS have the same color.
To avoid overcrowding, only a few labels are shown.
As you can see, the area inside New York city is actually split into many ZIP codes that are each named after different places.
Staten Island, Brooklyn, and Bronx are all famous parts of NYC that can easily be picked out in the example.
None of them are actually an incorporated city.
However, USPS uses those names to indicate the city for the ZIP codes located in those areas.
Because the area is so densely populated, many different areas within NYC are given names that are not "New York.
ZIP Codes Include Rural Areas Explanation Remember that people in rural areas outside of city limits still need to receive mail.
So, ZIP codes cover a much larger portion of the land area in the US than city limits.
This coverage is easily seen in the image examples shown for the area around Memphis, TN.
One map shows the color coded areas that make up the official city limits for the various cities in the region.
The second map shows all ZIP codes with the same primary city shaded using the same color.
Notice how many rural areas are grouped with nearby cities because they share delivery resources.
Correctly Matching ZIPs to Cities and Counties To solve these issues, we have compiled the overlap data between ZIP codes and cities as well as ZIP codes and counties.
We analyzed every block that the Census Bureau assigned within the U.
This means that you can determine what percentage of the population of a ZIP code is located within various city limits without complex analysis of tons of addresses, shapes, or areas.
We list the overlap based on area, land area, population, and number of households to suit various use cases.
You get two overlaps as percentages: percentage of the ZIP in an area and the percentage of the area in the ZIP.
To facilitate easier matching, various identifiers of valid us cities zip codes and counties are included such as FIPS and ANSI codes.
For instance, DC can be represented as "Washington, DC", "Washington D.
However, it will always have an FIPS code of 11.
As another example, St.
Louis, MO could be spelled as "St Louis", "St.
Louis", or "Saint Louis" in various data sets.
Keep in mind that there may be multiple rows in the data set for a single ZIP - for instance when a ZIP overlaps 2 counties, there will be two rows for that ZIP.
Note that not all ZIP codes, cities, or counties will be included in this data file.
Only the ZIPs that are studied by the Census Bureau that are geographically based approximately 33,000 are included.
Approximately 98% of counties and 95% of cities overlap with a ZIP code and are included.
There is inherently some loss in precision.
For example, the Navy may use a ZIP for several aircraft carriers.
Please take the above into consideration when choosing which set of coordinates to use.
Each can be useful in different types of situations.
Approximate Coordinates Green The approximate latitude and longitude coordinates from the National Weather Service that are rounded to 2 decimal places should be sufficient for many use cases.
Remember that a ZIP valid us cities zip codes often covers a large geographic area and that very precise latitude and longitude coordinates may be precise down to a very small radius - down to very small fractions of a mile which is much smaller than the geographic area covered by a ZIP code.
Changing the latitude or longitude coordinate by a single hundredth of a decimal place results in a shift of approximately 1 mile in any direction.
The radius of this shift is shown in the graphic in green.
As you can see, the lack of precision due to rounding to two valid us cities zip codes places is insignificant when compared to the reduction in precision caused by reducing a complex shape to a single point.
Many of these coordinates have been hand chosen.
The lack of additional digits after the decimal serves as a reminder to keep precision in mind when performing any calculations.
This method is shown in the example graphic in red.
As you can see, this can result in coordinates that do not actually lie within the region covered by the ZIP code.
The point chosen using this method is actually located within a small area that is not covered by the ZIP code.
Using this calculation method will result in a point outside of the ZIP code approximately 8% of the time.
Internal Point Coordinates The internal points are calculated by the.
They use a method similar to the bounding box method.
However, should a coordinate lie outside of the ZIP, as it does in the ZIP pictured, the coordinates will be shifted to the nearest internal point or internal point within land.
Polygon Offset Coordinates Black Another method for calculating the ZIP coordinates involves complex shape analysis of the polygon that represents the ZIP code called polygon offsetting or polygon buffering.
The result is a coordinate that will be within the largest section of the ZIP code.
This method is quite well suited to label positioning and is actually how the labels positions are determined on maps throughout the site.
As you can see from the image where this method is shown in black, this may be significantly different from the other two calculation methods.
It can also result in a point that is a much more significant distance from some sections of the ZIP code.
For instance, the example has a point that is very far from the south west portion of the ZIP.
Population Center Coordinates While the Census Bureau publishes centers of population for many different geographic areas of the country ex.
We use to calculate the population mean center.
As discussed in their analysis, the population mean center is frequently preferred over the population median center because it responds to more slight changes in population.
Realize that the population center of a ZIP code may actually lie outside the boundary of the ZIP code just as the bounding box coordinates do.
However, this occurrence should be rare.
Less than 3% of ZIP codes have a population center that lies outside of the boundary of the ZIP.
Coverage The approximate coordinates that are a combination of hand-picked coordinates and those from the National Weather Service NWS cover over 98% of all active and decomissioned ZIP codes - more than most of our competitors that only provide coordinates calculated by the Census Bureau.
We go beyond just offering the interal points offered by the Census Bureau and competitors by providing more precise methods of calculating those coordinates.
Because all of the coordinate calculation methods other than the National Weather Service data rely on Census data, those coordinates are only available for the ZIP codes included by the Census Bureau.
The Census Bureau researched 33,120 of the approximately 42,000 currently active ZIP codes.
While that may seem like a large discrepancy, you can see from the chart that over 93% of those ZIPs without Census data are for single buildings or military usage where an approximation is more than adequate.
For these reasons, any of the methods for calculating coordinates should suffice for the majority of the population.
However, we recommend you fall back to using the approximate coordinates from the National Weather Service in the case that you need coordinates for specific ZIPs other than the most commonly used ones.
Mileage Differences For most ZIP codes, the difference in coordinate calculation methods equates to valid us cities zip codes few miles.
However, for some, the choice of coordinates can make as much as a 20 or 30 mile difference.
Take ZIP code 71373 for instance.
A Comparison of ZIP Code Population Estimates A Brief Overview: Why not use the most recent data?
Our Recommendation: Unless you have a very specific need for comparing data to a single year, the valid us cities zip codes Census data likely provides a more accurate estimate of current population levels than the more recent but less accurate estimates from the IRS and less precise estimates of the ACS.
Over a 5 year period, the U.
That leaves an extremely small amount of room for error.
Another way to approximate the population is to use sampling.
The answers such as the number of people in the household help to estimate the population as a whole.
To get those huge savings, only a small percentage of the population is surveyed which leaves us with a range the population likely falls within instead of a precise number.
The margin of error that determines the size of the range is larger than the expected population growth.
Another way to approximate the population is to use an estimator.
As confirmed by the Internal Revenue Service IRSthe number of tax returns filed for a ZIP code can be used to approximate the number of households and the number of exemptions can be used to approximate the population.
However, as an estimator, it isn't perfect.
As discussed below, it is affected by economic changes as well as tax policy changes.
It also has strict privacy limits on data release such that it underestimates the population by more than the expected population growth.
Coverage: 3-Way Tie The 2010 Census was done precisely to estimate population sizes and so provides estimates for the most ZIP codes.
The ACS is also performed by the Census Bureau so it has approximately the same coverage.
Of the remaining ZIPs not included in 1 and 2 above that are omitted by the IRS, nearly 95% have a population under 500.
Other estimates for ZIPs with a very low population should be viewed with skepticism because the IRS data implements other privacy protection measures.
Readers should notice that the ZIP codes omitted from the IRS valid us cities zip codes set only account for around 2% of the total population so this is by no means a major issue.
ZIPs Omitted from IRS Estimates by Population Size As you can see most ZIPs omitted from the IRS data also have low population estimates from the Census Bureau.
In fact, over 1200 of valid us cities zip codes missing ZIPs are estimated to have a population of less than 100 people.
Accuracy Issues: IRS Improvements to 2010 Census Accuracy The largest objection to the census data is that it tabulates population based on ZIP Code Tabulation Area ZCTA as opposed to actual ZIP code.
Read more about the on our home page.
In response, the Census Bureau made significant changes in 2010 to how ZCTAs are tabulated.
For 2010 only legitimate five-digit areas are defined so there is no longer full nation-wide coverage.
The 2010 ZCTAs will better represent the actual Zip Code service areas because the Census Bureau initiated a process before creation of 2010 blocks to add block boundaries that split polygons with large numbers of addresses using different ZIP Codes.
The USPS makes periodic changes to ZIP Codes to support more efficient mail delivery.
The Code Tabulation Areas process used primarily residential addresses and was biased towards ZIP Codes used for city-style mail delivery, thus there may be ZIP Codes that are primarily nonresidential or boxes only that may not have a corresponding ZCTA.
Census Bureau Exemptions Aren't a Perfect Estimator The first issue with the accuracy of the IRS estimates is that their are using exemptions as an estimator for populations as opposed to directly trying to calculate population size.
Because it is only an estimator, it is still subject to variation due to other variables.
For instance, economic changes or changes in tax policy are likely to affect the population estimates.
It is highly unlikely that the population shrank by 5% in 2008.
It is much more likely that the economic downturn affected the estimates by changing how the population files their tax returns.
While other competitors that offer a free download with IRS data have suggested using the formula of "returns + joint returns + dependents" to estimate population size, the IRS suggests using the number of exemptions.
Our research backs up the suggestions put forth by the IRS.
Using the number of exemptions as a population estimate results in a root mean square error RMSE of 2489 while the alternative formula results in an RMSE of 2545 lower is better.
In general, the IRS underestimates the population of a ZIP as compared to ZCTAs by 10% to 20% for two reason.
Both of which are documented by the IRS.
The IRS documents only around 289 million exemptions compared to a population of 312 million estimated by the Census.
While 289 million exemptions are reported when examining state level data that is not subject to privacy protection, only 277 million valid us cities zip codes reported after privacy protection eliminates some data.
Margins Are Higher Than Expected Population Change The graph below shows the number of ZIPs by the margin of error as a percentage of the population.
Surveying a large portion of the population is expensive especially with the large number of questions besides population included in the ACS.
The Census Bureau publishes population estimates based on ACS surveys using data from the past 1 year, 3 years, or 5 years of data.
Including data from more years increases the sample size to improve the precision of the estimate at the cost of using less recent data.
We include the estimates based on the past 5 years worth of surveys because they are based on the largest sample to provide the most precise estimates.
Even so, the ACS only samples approximately 10% of the population over a 5 year period.
Recall that the population of the country is expected to change by less than 5% over a 5 year period and the population of any given ZIP is likely to change by less than 10%.
The easiest way to think about this is that it is difficult to provide an estimate with only a 5%-10% margin of error based on only surveying 10% of the population.
As you can see from the graph, the margin of error is 10% or more for over half of the ZIP codes - which is higher than the estimated population change.
To further illustrate this point, the 2010 Census population is within the most recent ACS margin of error for nearly 75% of ZIPs.
So, by choosing the ACS estimates over the Census, the population estimate would improve for 25% of ZIPs while becoming less accurate for nearly 75%.
We have included the margin of error with the ACS estimates so that those looking to create their own estimate can make their own judgement calls as to their formula for estimating the population for a given ZIP.
For those diving deeper into population estimates, we have examined whether the IRS and ACS estimates show the same relative change in population over various periods of time.
In other words, we asked this question: if the IRS estimates that the population of a ZIP increased over a certain period of time, does the ACS data also indicate a population increase?
We have found that there is a correlation between the two data sets.
However, that correlation only becomes apparent on estimates for ZIPs that have a very low margin of error.
You have indicated that you intend to use the data for a commercial purpose.
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US Zip Codes Database We're proud to offer a simple, accurate and up-to-date database of US Zip Codes. It's been built from the ground up using authoritative sources including the U.S. Postal Service™, U.S. Census Bureau, National Weather Service, American Community Survey, and the IRS.


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List of North American Numbering Plan area codes - Wikipedia
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We've been providing data to our clients for years and over 225,000 different individuals, organizations, and corporations of all sizes have trusted us to provide them with the high quality data that they need.
We don't just tell you about the quality, we show you the results of our verification and research see below and make sure you can quickly understand the most accurate ways to use the valid us cities zip codes we provide.
All data is consistently labeled, there are no duplicates, quality data sources minimize any inaccuracies, and multiple data sources verify accuracy.
We've done the work to combine data from multiple sources to make sure you have all of the fields you need.
Plus, we haven't included dozens of fields that you will never use and only slow you down.
Is your data up-to-date?
Update when you want.
If you can find any major changes before we make data updates, we'll issue a full refund.
Instead of locking our users into a recurring fee, we let you decide when updates are significant enough to warrant the time and cost of updating.
We also don't issue data updates for insignificant changes like updating a ZIP to show it has 3869 deliverable addresses instead of 3866.
Because it can take up to 5 years for people to fully utilize a ZIP, ZIP changes are minimized and a 10 year old data set would still contain 99% of currently active 5 digit ZIP codes.
Even so, when evaluating how often you want to update your data, keep in mind that many pieces of information about a ZIP code can be updated over time.
We recommend you update your list between once every year and once every 5 years depending on your data needs.
We've included the number of new ZIP codes added each year to assist you in making your decision.
How often are new ZIP codes created?
How many new ZIP codes are created every year?
It is typical for 10-20 new ZIP codes to be created each year.
How often often are zip codes changed?
What changes are there for zip codes?
Most of the information that changes about a ZIP code is related to the ZIP+4 the last 4 digits after the primary 5 digit ZIP code or the number of deliverable addresses.
Neither are included in the ZIP code database so updates can be less frequent.
The demographics of a ZIP can change over time so we issue frequent updates for statistics.
Are zip codes ever removed?
Are zip codes ever deleted from use?
Over 500 ZIP codes have been decomissioned as post offices close or the needs of the United States Postal Service change.
Tax Returns Filed for ZIPs Introduced in 2008 Over half of residents filed their tax return using a new ZIP code the first year it was introduced, but it can take up to 5 years for a ZIP to become fully active.
For example, you are allowed to make copies for backups as long as those backups are not publicly available.
You may also make copies for each workstation for each employee.
You may not make the data set publicly available for download over the internet or distribute the complete data set as part of an application provided to customers.
However, you may use on public networks such as the internet if used within a lookup application such as a "nearest store lookup" where the data set is not distributed to end users.
If you would like to redistribute the data or have a question about acceptable usage, please for further clarification and pricing options.
Quick ZIP Lookup and Data Analyzer Our spreadsheets now include an easy option to look up the statistics for select ZIPs.
Watch the demo of how you can combine the with our ZIP code spreadsheet to quickly lookup dozens of statistics for the ZIP codes that you have selected.
Plus, there is no ongoing fee.
Requires Excel 2007 or newer versions that open XLSX documents.
Counts households instead of the number of buildings ie.
However, we realize that there are many other uses for this data set so we have included lists of other cities that are recognized by USPS.
Acceptable cities are recognized by the USPS and should not result in delivery delays.
As you will learn below, certain geographic areas are frequently referred to by multiple names.
The boundaries of a ZIP code generally have nothing to do with city limits.
ZIP boundaries are set to aid mail delivery.
As a result, the USPS may refer to an area by a name which may be inside an incorporated city's city limits that uses another name and still have other names that are used in common conversation.
The list of unaccpetable cities may be fine for everyday conversation.
However, using them when addressing mail will likely result in delivery delays.
ZIP Code Boundaries Do Not Match Valid us cities zip codes Limits One of the most frequent questions we get is related to matching ZIPs to cities.
Remember that the boundaries of a ZIP code generally have nothing to do with city limits.
ZIP boundaries are set to aid mail delivery.
City limits are not.
Generally, USPS determines a mail route that best suites their needs, they assign a ZIP to that area, and they name the "city" of the ZIP after the post office s in that ZIP.
As you can see from the example image, about the only time the city limits and ZIP boundaries match up are across state lines and that isn't valid us cities zip codes universally true.
Many ZIPs cross state boundaries.
Think of it this way: if the postal carrier is driving down a road delivering mail and happens to cross the city limits, it makes little sense to have them stop delivering for the rest of the houses on the street simply because the city limits changed.
Instead, they'll keep delivering along the street to the next intersection or some other boundary that makes more sense to allocating their available resources, i.
ZIP "Cities" Often Aren't Incorporated Cities Futher, USPS does not always use the name of the incorporated city in which the ZIP code is located.
The assignment of cities to ZIP codes is more general.
The city is usually the name of the main post office.
The image example of New York, NY illustrates this point.
The black outline shows the area of the official city limits.
Every color coded region within is a different ZIP code.
ZIPs with the same city according to USPS have the same color.
To avoid overcrowding, only a few labels are shown.
As you can see, the area inside New York city is actually split into many ZIP codes that are each named after different places.
Staten Island, Brooklyn, and Bronx are all famous parts of NYC that can easily be picked out in the example.
None of them are actually an incorporated city.
However, USPS uses those names to indicate the city for the ZIP codes located in those areas.
Because the area is so densely populated, many different areas within NYC are given names that are not "New York.
ZIP Codes Include Rural Areas Explanation Remember that people in rural areas outside of city limits still need to receive mail.
So, ZIP codes cover a much larger portion of the land area in the US than city limits.
This coverage is easily seen in the image examples shown for the area around Memphis, TN.
One map shows the color coded areas that make up the official city limits for the various cities in the region.
The second map shows all ZIP codes with the same primary city shaded using the same color.
Notice how many rural areas are grouped with nearby cities because they share delivery resources.
Correctly Matching ZIPs to Cities and Counties To solve these issues, we have compiled the overlap data between ZIP codes and cities as well as ZIP codes and counties.
We analyzed every block that the Census Bureau assigned within valid us cities zip codes U.
This means that you can determine what percentage of the population of a ZIP code is located within various city limits without complex analysis of tons of addresses, shapes, or areas.
We list the overlap based on area, land area, population, and number of households to suit various use cases.
You get two overlaps as percentages: percentage of the ZIP in an area and the percentage of the area in the ZIP.
To facilitate easier matching, various identifiers of cities and counties are included such as FIPS and ANSI codes.
For instance, DC can be represented as "Washington, DC", "Washington D.
However, it will always have an FIPS code of 11.
As another example, St.
Louis, MO could be spelled as "St Louis", "St.
Louis", or "Saint Louis" in various data sets.
Keep in mind that there may be multiple rows in the data set for a single ZIP - for instance when a ZIP overlaps 2 counties, there will be two rows for that ZIP.
Note that not all ZIP codes, cities, or counties will be included in this data file.
Only the ZIPs that are studied by the Census Bureau that are geographically based approximately 33,000 are included.
Approximately 98% of counties and 95% of cities overlap with a ZIP code and are included.
There is inherently some loss in precision.
For example, the Navy may use a ZIP for several aircraft carriers.
Please take the above into consideration when choosing which set of coordinates to use.
Each can be useful in different types of situations.
Approximate Coordinates Green The approximate latitude and longitude coordinates from the National Weather Service that are rounded to 2 decimal places should be sufficient for many use cases.
Remember that a ZIP code often covers a large geographic area and that very precise latitude and longitude coordinates may be precise down to a very small radius - down to very small fractions of a mile which is much smaller than the geographic area covered by a ZIP code.
Changing the latitude or longitude coordinate by a single hundredth of a decimal place results in a shift of approximately 1 mile in any direction.
The radius of this shift is shown in the graphic in green.
As you can see, the lack of precision due to rounding to two decimal places is insignificant when compared to the reduction in valid us cities zip codes caused by reducing a complex shape to a single point.
Many of these coordinates have been hand chosen.
The lack of additional digits after the decimal serves as a reminder to keep precision in mind when performing any calculations.
This method is shown in the example graphic in red.
As you can see, this can result in coordinates that do not actually lie within the region covered by the ZIP code.
The point chosen using this method is actually located within a small area that is not covered by the ZIP code.
Using this calculation method will result in a point outside of the ZIP code approximately 8% of the time.
Internal Point Coordinates The internal points are calculated by the.
They use a method similar to the bounding box method.
However, should a coordinate lie outside of the ZIP, as it does in the ZIP pictured, the coordinates will be shifted to the nearest internal point or internal point within land.
Polygon Offset Coordinates Black Another method for calculating the ZIP coordinates involves complex shape analysis of the polygon that represents the ZIP code called polygon offsetting or polygon buffering.
The result is a coordinate that will be within the largest section of the ZIP code.
This method is quite well suited to label positioning and is actually how the labels positions are determined on maps throughout the site.
As you can see from the image where this method is shown in black, this may be significantly different from the other two calculation methods.
It can also result in a point that is a much more significant distance from some sections of the ZIP code.
For instance, the example has a point that is very far from the south west portion of the ZIP.
Population Center Coordinates While the Census Bureau publishes centers of population for many different geographic areas of the country ex.
We use to calculate the population mean center.
As discussed in their analysis, the population mean center is frequently preferred over the population median center because it responds to more slight changes in population.
Realize that the population center of a ZIP code may actually lie outside the boundary of the ZIP code just as the bounding box coordinates do.
However, this occurrence should be rare.
Less than 3% of ZIP codes have a population center that lies outside of the boundary of the ZIP.
Coverage The approximate coordinates that are a combination of hand-picked coordinates and those from the National Weather Service NWS cover over 98% of all active and decomissioned ZIP codes - more than most of our competitors that only provide coordinates calculated by the Census Bureau.
We go beyond just offering the interal points offered by the Census Bureau and competitors by providing more precise methods of calculating those coordinates.
Because all of the coordinate calculation methods other than the National Weather Service data rely on Census data, those coordinates are only available for the ZIP codes included by the Census Bureau.
The Census Bureau researched 33,120 of the approximately 42,000 currently active ZIP codes.
While that may seem like a large discrepancy, you can see from the chart that over 93% of those ZIPs without Census data are for single buildings or military usage where an approximation is more than adequate.
For these reasons, any of the methods for calculating coordinates should suffice for the majority of the population.
However, we recommend you fall back to using the approximate coordinates from the National Weather Service in the case that you need coordinates for specific ZIPs other than the most commonly used ones.
Mileage Differences For most ZIP codes, the difference in coordinate calculation methods equates to a few miles.
However, for some, the choice of coordinates can make as much as a 20 or 30 mile difference.
Take ZIP code 71373 for instance.
A Comparison of ZIP Code Population Estimates A Brief Overview: Why not use the most recent data?
Our Recommendation: Unless you have a very specific need for comparing data to a single year, the 2010 Census data likely provides a more accurate estimate of current population levels than the more recent but less accurate estimates from the IRS and less precise estimates of the ACS.
Over a 5 year period, the U.
That leaves an extremely small amount of room for error.
Another way to approximate the population is to use sampling.
The answers such as the number of people in the household help to estimate the population as a whole.
To get those huge savings, only a small percentage of the population is surveyed which leaves us with a range the population likely falls within instead of a precise number.
The margin of error that determines the size of the range is larger than the expected population growth.
Another way to approximate the population is to use an estimator.
As confirmed by the Internal Revenue Service IRSthe number of tax returns filed for a ZIP code can be used to approximate the number of households and the number of exemptions can be used to approximate the population.
However, as an estimator, it isn't perfect.
As discussed below, it is affected by economic changes as well as tax policy changes.
It also has strict privacy limits on data release such that it underestimates the population by more than the expected population growth.
Coverage: 3-Way Tie The 2010 Census was done precisely to estimate population sizes and so provides estimates for the most ZIP codes.
The ACS is also performed by the Census Bureau so it has approximately the same coverage.
Of the remaining ZIPs not included in 1 and 2 above that are omitted by the IRS, nearly 95% have a population under 500.
Other estimates for ZIPs with a very low population should be viewed with skepticism because the IRS data implements other privacy protection measures.
Readers should notice valid us cities zip codes the ZIP codes omitted from the IRS data set only account for around 2% of the total population so this is by no means a major issue.
ZIPs Omitted from IRS Estimates by Population Size As you can see most ZIPs omitted from the IRS data also have low population estimates from the Census Bureau.
In fact, over 1200 of the missing ZIPs are estimated to have a population of less than 100 people.
Accuracy Issues: IRS Improvements to 2010 Valid us cities zip codes Accuracy The largest objection to the census data is that it tabulates population based on ZIP Code Tabulation Area ZCTA as opposed to actual ZIP code.
Read more about the on our home page.
In response, the Census Bureau made significant changes in 2010 to how ZCTAs are tabulated.
For 2010 only legitimate five-digit areas are defined so there is no longer full nation-wide coverage.
The 2010 ZCTAs will better represent the actual Zip Valid us cities zip codes service areas because the Census Bureau initiated a process before creation of 2010 blocks to add block boundaries that split polygons with large numbers of addresses using different ZIP Codes.
The USPS makes periodic changes to ZIP Codes to support more efficient mail delivery.
The Code Tabulation Areas process used primarily residential addresses and was biased towards ZIP Codes used for city-style mail delivery, thus there may be ZIP Codes that are primarily nonresidential or boxes only that may not have a corresponding ZCTA.
Census Bureau Exemptions Aren't a Perfect Estimator The first issue with the accuracy of the IRS estimates is that their are using exemptions as an estimator for populations as opposed to directly trying to calculate population size.
Because it is only an estimator, it is still subject to variation due to other variables.
For instance, economic changes or changes in tax policy are likely to affect the population estimates.
It is highly unlikely that the population shrank by 5% in 2008.
It is much more likely that the economic downturn affected the estimates by changing how the population files their tax returns.
While other competitors that offer a free download with IRS data have suggested using the formula of "returns + joint returns + dependents" to estimate population size, the IRS suggests using the number of exemptions.
Our research backs up the suggestions put forth by the IRS.
Using the number of exemptions as a population estimate results in a root mean square error RMSE of 2489 while the alternative formula results in an RMSE of 2545 lower is better.
In general, the IRS underestimates the population of a ZIP as compared to ZCTAs by 10% to 20% for two reason.
Both of which are documented by the IRS.
The IRS documents only around 289 million exemptions compared to a population of 312 million estimated by the Census.
While 289 million exemptions are reported when examining state level data that is not subject to privacy protection, only 277 million are reported after privacy protection eliminates some data.
Margins Are Higher Than Expected Population Change The graph below shows the number of ZIPs by the margin of error as a percentage of the population.
Surveying a large portion of the population is expensive especially with the large number of questions besides population included in the ACS.
The Census Bureau publishes population estimates based on ACS surveys using data from the past 1 year, 3 years, or 5 years of data.
Including data from more years increases the sample size to improve the precision of the estimate at the cost of using less recent data.
We include the estimates based on the past 5 years worth of surveys because they are based on the largest sample to provide the most precise estimates.
Even so, the ACS only samples approximately 10% of the population over a 5 year period.
Recall that the population of the country is expected to change by less than 5% over a 5 year period and the population of any given ZIP is likely to change by less than 10%.
The easiest way to think about this is that it is difficult to provide an estimate with only a 5%-10% margin of error based on only surveying 10% of the population.
As you can see from the graph, the margin of error is 10% or more for over half of the ZIP read more - which is higher than the estimated population change.
To further illustrate this point, the 2010 Census population is within the most recent ACS margin of error for nearly 75% of ZIPs.
So, by choosing the ACS estimates over the Census, the population estimate would improve for 25% of ZIPs while becoming less accurate for nearly 75%.
We have included the margin of error with the ACS estimates so that those looking to create their own estimate can make their own judgement calls as to their formula for estimating the population for a given ZIP.
For those diving deeper into population estimates, we have examined whether the IRS and ACS estimates show the same relative change in population over various periods of time.
In other words, we asked this question: if the IRS estimates that the population of a ZIP increased over a certain period of time, does the ACS data also indicate a population increase?
We have found that there is a correlation between the two data sets.
However, that correlation only becomes apparent on estimates for ZIPs that have a very low margin of error.
You have indicated that you intend to use the data for a commercial purpose.
Census Bureau, Yahoo, Google, FedEx, and UPS.

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Valid US Cities and Zip Codes. While this is by no means a *complete* listing, it will serve as a handy reference when some nosey website demands a valid US city and ZIP code before they'll give you your password. Pick out your favourite state, and make yourself up a street address!


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U.S. ZIP Code Database List (5 Digit ZIP Codes)
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Complete List of United States Zip Codes | AggData
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Top 10 Best Zip Codes in California. Guess how many are in Silicon Valley.

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Zip codes 01001 - 01890 Zip codes 01901 - 02816 Zip codes 02817 - 03840 Zip codes 03841 - 04562 Zip codes 04563 - 05346 Zip codes 05350 - 06268 Zip codes 06269 - 07111 Zip codes 07112 - 08066 Zip codes 08067 - 10075 Zip codes 10103 - 11364 Zip codes 11365 - 12093 Zip codes 12094 - 12767 Zip codes 12768 - 13308 Zip codes 13309 - 14004 Zip codes.


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Random Zip Codes — US City Postal Codes
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Random Zip Codes — US City Postal Codes
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State Hawaii HI USA Zip Codes, Cities, Counties

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The first digit of a five-digit ZIP Code divides the United States into 10 large groups of states numbered from 0 in the Northeast to 9 in the far West - 00601 for Adjuntas, Pueto Rico. The list includes the postal codes (zip codes) and the associated cities, listed in alphabetical order by city.


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Random Zip Codes — US City Postal Codes
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We've been providing data to our clients for years and over 225,000 different individuals, organizations, and corporations of all sizes have trusted us to provide them with the high quality data that they need.
We don't just tell you about the quality, we show you the results of our verification and research see below and make sure you can quickly understand the most accurate ways to use the data we provide.
All data is consistently labeled, there are no duplicates, quality data sources minimize any inaccuracies, and multiple data sources verify accuracy.
We've done the work to combine data from multiple sources to make sure you have all of the fields you need.
Plus, we haven't included dozens of fields that you will never use and only slow you down.
Is your data up-to-date?
Update when you want.
If you can find any major changes before we make data updates, we'll issue a full refund.
Instead of locking our users into a recurring fee, we let you decide when updates are significant enough to warrant the time and cost of updating.
We also don't issue data updates for insignificant changes like updating a ZIP to show it has 3869 deliverable addresses instead of 3866.
Because it can take up to 5 years for people to fully utilize a ZIP, ZIP changes are minimized and a 10 year old data set would still contain 99% of currently active 5 digit ZIP codes.
Even so, when evaluating how often you want to update your data, keep in mind that many pieces of information about a ZIP code can be updated over time.
We recommend you update your list between once every year and once every 5 years depending on your data needs.
We've included the number of new ZIP codes added each year to assist you in making your decision.
How often are new ZIP codes created?
How many new ZIP codes are created every year?
It is typical for 10-20 new ZIP codes to be created each year.
How often often are zip codes changed?
What changes are there for zip codes?
Most of the information that changes about a ZIP code is related to the ZIP+4 the last 4 digits after the primary 5 digit ZIP code or the number of deliverable addresses.
Neither are included in the ZIP code database so updates can be less frequent.
The demographics of a ZIP can change over time so we issue frequent updates for statistics.
Are zip codes ever removed?
Are zip codes ever deleted from use?
Over 500 ZIP codes have been decomissioned as post offices close or the needs of the United States Postal Service change.
Tax Returns Filed for ZIPs Introduced in 2008 Over half of residents filed their tax return using a new ZIP code the first year it was introduced, but it can take up to 5 years for a ZIP to become fully active.
For example, you are allowed to make copies for backups as long as those backups are not publicly available.
You may also make copies for each workstation for each employee.
You may not make the data set publicly available for download over the internet or distribute the complete data set as part of an application provided to valid us cities zip codes />However, you may valid us cities zip codes on public networks such as the internet if used within a lookup application such as a "nearest store lookup" where the data set is not distributed to end users.
If you would like to redistribute the data or have a question about acceptable usage, please for further clarification and pricing options.
Quick ZIP Lookup and Data Analyzer Our spreadsheets now include an easy option to look up the statistics for select ZIPs.
Watch the demo of how you can combine the with our ZIP code spreadsheet to quickly lookup dozens of statistics for the ZIP codes that you have selected.
Plus, there is no ongoing fee.
Requires Excel 2007 or newer versions that open XLSX documents.
Counts households instead of the number of buildings ie.
However, we realize that there are many other uses for this data set so we have included lists of other cities that are recognized by USPS.
Acceptable cities are recognized by the USPS and should not result in delivery delays.
As you will learn below, certain geographic areas are frequently referred to by multiple names.
The boundaries of a ZIP code generally have nothing to do with city limits.
ZIP boundaries are set to aid mail delivery.
As a result, the USPS may refer to an area by a name which may be inside an incorporated city's city limits that uses another name and still have other names that are used in common conversation.
The list of unaccpetable cities may be fine for everyday conversation.
However, using them when addressing mail will likely result in delivery delays.
ZIP Code Boundaries Do Not Match Valid us cities zip codes Limits One of the most frequent questions we get is related to matching ZIPs to cities.
Remember that the boundaries of a ZIP code generally have nothing to do with city limits.
ZIP boundaries are set to aid mail delivery.
City limits are not.
Generally, USPS determines a mail route that best suites their needs, they assign a ZIP to that area, and they name the "city" of the ZIP after the post office s in that ZIP.
As you can see from the example image, about the only time the city limits and ZIP boundaries match up are across state lines and that isn't even universally true.
Many ZIPs cross state boundaries.
Think of it this way: if the postal carrier is driving down a road delivering mail and happens to cross the city limits, it makes little sense to have them stop delivering for the rest of the houses on the street simply because the city limits changed.
Instead, they'll keep delivering along the street to the next intersection or some other boundary that makes more sense to allocating their available resources, i.
ZIP "Cities" Often Aren't Incorporated Cities Futher, USPS does not always use the name of the incorporated city in which the ZIP code is located.
The assignment of cities to ZIP codes is more general.
The city is usually the name of the main post office.
The image example of New York, NY illustrates this point.
The black outline shows the area of the official city limits.
Every color coded region within is a different ZIP code.
ZIPs with the same city according to USPS have the same color.
To avoid overcrowding, only a few labels are shown.
As you can see, the area inside New York city is actually split into many ZIP codes that are each named after different places.
Staten Island, Brooklyn, and Bronx are all famous parts of NYC that can easily be picked out in the example.
None of them are actually an incorporated city.
However, USPS uses those names to indicate the city for the ZIP codes located in those areas.
Because the area is so densely populated, many different areas within NYC are given names that are not "New York.
ZIP Codes Include Rural Areas Explanation Remember that people in rural areas outside of city limits still need to receive mail.
So, ZIP codes cover a much larger portion of the land area in the US than city limits.
This coverage is easily seen in the image examples shown for the area around Memphis, TN.
One map shows the color coded areas that make up the official city limits for the various cities in the region.
The second map shows all ZIP codes with the same primary city shaded using the same color.
Notice how many rural areas are grouped with nearby cities because they share delivery resources.
Correctly Matching ZIPs to Cities and Counties To solve these issues, we have compiled the overlap data between ZIP codes and cities as well as ZIP codes and counties.
We analyzed every block that the Census Bureau assigned within the U.
This means that you can determine what percentage of the population of a ZIP code is located within various city limits without complex analysis of tons of addresses, shapes, or areas.
We list the overlap based on area, land area, population, and number of households to suit various use cases.
You get two overlaps as percentages: percentage of the ZIP in an area and the percentage of the area in the ZIP.
To facilitate easier matching, various identifiers of cities and counties are included such as FIPS and ANSI codes.
For instance, DC can be represented as "Washington, DC", "Washington D.
However, it will always have an FIPS code of 11.
As another example, St.
Louis, MO could be spelled as "St Louis", "St.
Louis", or "Saint Louis" in various data sets.
Keep in mind that there may be multiple rows in the data set for a single ZIP - for instance when a ZIP overlaps 2 counties, there will be two rows for that ZIP.
Note that not all ZIP codes, cities, or counties will be included in this data file.
Only the ZIPs that are studied by the Census Bureau that are geographically based approximately 33,000 are included.
Approximately 98% of counties and 95% of cities overlap with a ZIP code and are included.
There is inherently some loss in precision.
For example, the Navy may use a ZIP for several aircraft carriers.
Please take the above into consideration when choosing which set of coordinates to use.
Each can be useful in different types of situations.
Approximate Coordinates Green The approximate latitude and longitude coordinates from the National Weather Service that are rounded valid us cities zip codes 2 decimal places should be sufficient for many use cases.
Remember that a ZIP code often covers a large geographic area and that very precise latitude and longitude coordinates may be precise down to a very small radius - down to very small fractions of a mile which is much smaller than the geographic area covered by a ZIP code.
Changing the latitude or longitude coordinate by a single hundredth of a decimal place results in a shift of approximately 1 mile in any direction.
The radius of this shift is shown in the graphic in green.
As you can see, the lack of precision due to rounding to two decimal places is insignificant when compared to the reduction in precision caused by reducing a complex shape to a single point.
Many of these coordinates have been hand chosen.
The lack of additional digits after the decimal serves as a reminder to keep precision in mind when performing any calculations.
This method is shown in the example graphic in red.
As you can see, this can result in coordinates that do not actually lie will valid us cities zip codes advise the region covered by the ZIP code.
The point chosen using this method is actually located within a small area that is not covered by the ZIP code.
Using this calculation method will result in a point outside of the ZIP code approximately 8% of the time.
Internal Point Coordinates The internal points are calculated by the.
They use a method similar to the bounding box method.
However, should a coordinate lie outside of the ZIP, as it does in the ZIP pictured, the coordinates will be shifted to the nearest internal point or internal point within land.
Polygon Offset Coordinates Black Another method for calculating the ZIP coordinates involves complex shape analysis of the polygon that represents the ZIP code called polygon offsetting or polygon buffering.
The result is a coordinate that will be within the largest section of the ZIP code.
This method is quite well suited to label positioning and is actually how the labels positions are determined on maps throughout the site.
As you can see from the image where this method is shown in black, this may be significantly different from the other two calculation methods.
It can also result in a point that is a much more significant distance from some sections of the ZIP code.
For instance, the example has a point that is very far from the south west portion of the ZIP.
Population Center Coordinates While the Census Bureau publishes centers of population for many different geographic areas of the country ex.
We use to calculate the population mean center.
As discussed in their analysis, the population mean center is frequently preferred over the population median center because it responds to more slight changes in population.
Realize that the population center of a ZIP code may actually lie outside the boundary of the ZIP code just as the bounding box coordinates do.
However, this occurrence should be rare.
Less than 3% of ZIP codes have a population center that lies outside of the boundary of the ZIP.
Coverage The approximate coordinates that are a combination of hand-picked coordinates and those from the National Weather Service NWS cover over 98% of all active and decomissioned ZIP codes - more than most of our competitors that only provide coordinates calculated by the Census Bureau.
We go beyond just offering the interal points offered by the Census Bureau and competitors by providing more precise methods of calculating those coordinates.
Because all of the coordinate calculation methods other than the National Weather Service data rely on Census data, those coordinates are only available for the ZIP codes included by the Census Bureau.
The Census Bureau researched 33,120 of the approximately 42,000 currently active ZIP codes.
While that may seem like a large discrepancy, you can see from the chart that over 93% of those ZIPs without Census data are for single buildings or military usage where an approximation is more than adequate.
For these reasons, any of the methods for calculating coordinates should suffice for the majority of the population.
However, we recommend you fall back to using the approximate coordinates from the National Weather Service in the case that you need coordinates for specific ZIPs other than the most commonly used ones.
Mileage Differences For most ZIP codes, the difference in coordinate calculation methods equates to a few miles.
However, for some, the choice of coordinates can make as much as a 20 or 30 mile difference.
Take ZIP code 71373 for instance.
A Comparison of ZIP Code Population Estimates A Brief Overview: Why not use the most recent data?
Our Recommendation: Unless you have a very specific need for comparing data to a single year, the 2010 Census data likely provides a more accurate estimate of current population levels than the more recent but less accurate estimates from the IRS and less precise estimates of the ACS.
Over a 5 year period, the U.
That leaves an extremely small amount of room for error.
Another way to approximate the population is to use sampling.
The answers such as the number of people in the household help to estimate the population as a whole.
To get those huge savings, only a small percentage of the population is surveyed which leaves us with a range the population likely falls within instead of a precise number.
The margin of error that determines the size of the range is larger than the expected population growth.
Another way to approximate the population is to use an estimator.
As confirmed by the Internal Revenue Service IRSthe number of tax returns filed for a ZIP code can be used to approximate the number of households and the number of exemptions can be used to approximate the population.
However, as an estimator, it isn't perfect.
As discussed below, it is affected by economic changes as well as tax policy changes.
It also has strict privacy limits on data release such that it underestimates the population by more than the expected population growth.
Coverage: 3-Way Tie The 2010 Census was done precisely to estimate population sizes and so provides estimates for the most ZIP codes.
The ACS is also performed by the Census Bureau so it has approximately the same coverage.
Of the remaining ZIPs not included in 1 and 2 above that are omitted by the IRS, nearly 95% have a population under 500.
Other estimates for ZIPs with a very low population should be viewed with skepticism because the IRS data implements other privacy protection measures.
Readers should notice that the ZIP codes omitted from the IRS data set only account for around 2% of the total population so this is by no means a major issue.
ZIPs Omitted from IRS Estimates by Population Size As you can see most ZIPs omitted from the IRS data also have low population estimates from the Census Bureau.
In fact, over 1200 of the missing ZIPs are estimated to have a population of less than 100 people.
Accuracy Issues: IRS Improvements to 2010 Census Accuracy The largest objection to the census data is that it tabulates population based on ZIP Code Tabulation Area ZCTA as opposed to actual ZIP code.
Read more about the on our home page.
In response, the Census Bureau made significant changes in 2010 to how ZCTAs are tabulated.
For 2010 only legitimate five-digit areas are defined so there is no longer full nation-wide coverage.
The 2010 ZCTAs will better represent the actual Zip Code service areas because the Census Bureau initiated a process before creation of 2010 blocks to add block boundaries that split polygons with large numbers of addresses using different ZIP Codes.
The USPS makes periodic changes to ZIP Codes to support more efficient mail delivery.
The Code Tabulation Areas process used primarily residential addresses and was biased towards ZIP Codes used for city-style mail delivery, valid us cities zip codes there may be ZIP Codes that are primarily nonresidential or boxes only that may not have a corresponding ZCTA.
Census Bureau Exemptions Aren't a Perfect Estimator The first issue with the accuracy of the IRS estimates is that their are using exemptions as an estimator for populations as opposed to directly trying to calculate population size.
Because it is only an estimator, it is still subject to variation due to other variables.
For instance, economic changes or changes in tax policy are likely to affect the population estimates.
It is highly unlikely that the population shrank by 5% in 2008.
It is much more likely that the economic downturn affected the estimates by changing how the population files their tax returns.
While other competitors that offer a free download with IRS data have suggested using the formula of "returns + joint returns + dependents" to estimate population size, the IRS suggests using the number of exemptions.
Our research backs up the suggestions put forth by the IRS.
Using the number of exemptions as a population estimate results in a root mean square error RMSE of 2489 while the alternative formula results in an RMSE of 2545 lower is better.
In general, the IRS underestimates the population of a ZIP as compared to ZCTAs by 10% to 20% for two reason.
Both of which are documented by the IRS.
The IRS documents only around 289 million exemptions compared to a population of 312 million estimated by the Census.
While 289 million exemptions are reported when examining state level data that is valid us cities zip codes subject to privacy protection, only 277 million are reported after privacy protection eliminates some data.
Margins Are Higher Than Expected Population Change The graph below shows the number of ZIPs by the margin of error as a percentage of the population.
Surveying a large portion of the population is expensive especially with the large number of questions besides population included in the ACS.
The Census Bureau publishes population estimates based on ACS surveys using data from the past 1 year, 3 years, or 5 years of data.
Including data from more years increases the sample size to improve the precision of the estimate at the cost of using less recent data.
We include the estimates based on the past 5 years worth of surveys because they are based on the largest sample to provide the most precise estimates.
Even so, the ACS only samples approximately 10% of the population over a 5 year period.
Recall that the population of the country is expected to change by less than 5% over a 5 year period and the population of any given ZIP is likely to change by less than 10%.
The easiest way to think about this is that it is difficult to provide an estimate with only a 5%-10% margin of error based on only surveying 10% of the population.
As you can see from the graph, the margin of error is 10% or more for over half of the ZIP codes - which is higher than the estimated population change.
To further illustrate this point, the 2010 Census population is within the most recent ACS margin of error for nearly 75% of ZIPs.
So, by choosing the ACS estimates over the Census, the population estimate would improve for 25% of ZIPs while becoming less accurate for nearly 75%.
We have included the margin of error with the ACS estimates so that those looking to create their own estimate can make their own judgement calls as to their formula for estimating the population for a given ZIP.
For those diving deeper into population estimates, we have examined whether the IRS and ACS estimates show the same relative change in population over various periods of time.
In other words, we asked this question: if the IRS estimates that the population of a ZIP increased over a certain period of time, does the ACS data also indicate a population increase?
We have found that there is a correlation between the two data sets.
However, that correlation only becomes apparent on estimates for ZIPs that have a very low margin of error.
You have indicated that you intend to use the data for a commercial purpose.
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