Postal search engines and directories
Address Management System Office Locator
City/State/ZIP Code Associations
- Search for associated ZIP Codes by enter ing a city and state name into the search form.
National Address Server
- Given a valid U.S. postal address, this server attempts to rewrite the address in the proper format along with the ZIP+4 code.
Official USPS Abbreviations
- Directory of state abbreviations, street suffixes, and secondary unit designators.
- Find zip codes by city and state. Or find city and state by zip code.