Does USPS offer ZIP code lookup?

The United States Postal Service has a ZIP code lookup link on its website, USPS.com. The site has tools to find a specific ZIP code for an address and a reverse lookup to find all cities with a certain ZIP code.

To find a ZIP code, navigate to the USPS website and click on Look Up a ZIP Code. Enter the street address, city and state and click Find. The nine-digit ZIP code for the address will be displayed.

To find a list of cities with a specific ZIP code, click Look Up a ZIP Code from the home page and click the Cities By ZIP Code tab. Enter the ZIP code and click Find.