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The ZIP Code Look-Up and City/State/ZIP Code Association are free services provided by the USPS to assist the public with their addressing needs. These services are being updated and reviewed daily for more accurate retrieval data.
Some large metropolitan areas require the entry of a best guess 5-digit ZIP code to retrieve the most accurate ZIP+4. For more information on ZIP Codes please call the toll free ZIP Code Information number at 800-275-8777.
ZIP Code Look-Up and Address Information
ZIP+4 Code Look-Up Engine
Click here to locate a ZIP+4 code for your address
City/State/ZIP Code Associations
Click here to associate ZIP Codes with city/state names
Address Management System (AMS) Office Locator
Click here to locate any AMS office in the nation
ZIP Code FAQs
Click here for a list of frequently asked questions regarding ZIP Codes
Official USPS Abbreviations
Click here for lists of state, street suffix, and secondary unit designators.
Vendors and Licensees
Click here for a list of vendors and licensees.
© 1998 United States Postal Service. All rights reserved. Developed by the USPS National Customer Support Center.
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