Go to USPS. Sign In. FAQs Home. How can we help? Search for a topic. ZIP Codes. Share via email. Information Article Number. Customer Information. City names that are abbreviated will frequently be listed as unacceptable because abbreviations are not an acceptable city name format. Not Acceptable or Unacceptable : Means an inadequate city name has been entered or received based on information entered.
Unique : Assigned to a company, government agency, or entity with sufficient mail volume, based on average daily volume of letter size mail received, availability of ZIP Code numbers in the postal area, and USPS cost-benefit analysis. Register your company and authorized users using Customer Registration. Select the media type that you intend to use. 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 delivery, ZIP codes may not be defined or have unclear boundaries. 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. 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 ZIP code such as much of Nevada and Utah 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. Their purpose is to convey statistical data about regions that are familiar to most citizens. 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. 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 you select the LZPS menu option, make sure you are logged onto the application server specified by the properties file.
City State data file found? When you select this menu option, the screen indicates whether there is a data file with the correct name in the location indicated by the properties file:. Indicates that there is no file with the name and location indicated in the properties file. Copy the data file using the directory and file name indicated, and then return to the Load USPS File screen to try again.
Also, make sure that you are logged onto the application server specified in the properties file. Indicates that there is a file using the correct name in the directory indicated, but it contains no data. Copy the original data file using the directory and file name indicated, and then return to the Load USPS File screen to try again.
Note: This message indicates that the system has located a file with the correct name and location and that it contains data. It does not indicate whether the file includes postal code data or whether it is in the correct format. Completing this screen: If the file has been found and is ready to be loaded:. Optionally, deselect the Submit on hold option if you would like the job to run immediately; otherwise, you will need to select Release for the LZPS job at the Job Management Screen when you are ready to run it.
You might expect the job to take several minutes to a half hour to complete, depending on how many new postal code records you are loading.
Updates: See the Upload Process for an overview of the processing steps. Postal Service that is:. The U. Postal Service can provide the City State product, which includes a comprehensive list of ZIP codes and related cities and states. Postal Service?
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