National ZIP+4 Address Database TM (March 2014 data)5-digit ZIP code, ZIP+4 add on, city, state, street address, carrier route, county FIPS code, and congressional district information!
National ZIP+4 Address Database Information Source
The National ZIP+4 Address Database is published by CD Light, LLC, a company which holds a non-exclusive license from the United States Postal Service to publish and sell the National ZIP+4 Address Database. The content of these files comes directly from the United States Postal Service, which is solely responsible for the accuracy of the information contained therein.
National ZIP+4 Address Database Contents
This database also includes the US Postal Service city-state file, which contains a complete listing of the approximately 42,700 5-digit ZIP codes currently assigned by the USPS. This file has approximately 71,500 fixed-field-length ASCII records of 129 bytes each. This file is also compressed using PKZIP V2.04g.
Here are some of the fields contained in each ZIP+4 address record:
Where an address record identifies an exact street address, the primary low address and the primary high address fields are identical.
Click here to download a self-extracting file containing sample records from this database, with documentation. (about 108 KB).
An address range record defines the lowest and highest street numbers which can exist for a given "block face" as well as the ZIP+4, carrier route number, and county name which apply to all addresses which may actually exist on that block face. In many cases exact street numbers are not actually defined in the database. This, by the way, is exactly the case for all commercial products based on the USPS ZIP+4 address database.
Matching the ZIP+4 Records to the City-State File
CAUTION - THIS DATABASE IS VERY LARGE AND NOT EASY TO USE. IT IS BEST SUITED FOR EXPERIENCED SOFTWARE DEVELOPERS ONLY!
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