PHP Classes

PHP USPS API Zip Code: Get the zip code of a given location with USPS API

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usps-zipcode 2GNU General Publi...7.4PHP 5, E-Commerce, Web services


This package is specific mainly for applications used in United States United States .

This class can get the zip code of a given location with USPS API.

It can send a HTTP request to the USPS API Web server to request the zip code for a given physical address in the United States.

The class can parse the response and return the zip code that was found for that address.

Version 2.0 of this package increases the minimum required PHP version to 7.4. It is fully compliant without deprecated code in 8.2.

It supports USPS API v3 system.

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Many applications that deal with addresses of people or companies need to know the addresses where they are located, so they can send them postal mail or parcels.

One of the details that is necessary to know about an address is the zip code.

This class can determine the zip code of a given location using the street address and city and the USPS API to find out the zip code of location in the United States.

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This CLASS is designed to take advantage of the USPS API for looking up the corrected (normalized) address for a given physical address. There is very little examples of implementing the USPS API in PHP.


When you instantiate the class, include the API key. See the example.php file for usage. If you don't have a valid API, you can get one free at

Revision History:

  • 1.0 Initial Release
  • 1.1 Bugfix 500 error.
  • 2.0 Updated for new USPS API V3 & PHP 8 coding standards

This code was written by request by another developer on because Streetlayers is going away very soon.


GNU General Public License v3.0 (GNU GPLv3)

  Files folder image Files  
File Role Description
Accessible without login Plain text file example.php Example Example script
Accessible without login Plain text file LICENSE Lic. License text
Accessible without login Plain text file Doc. Documentation
Plain text file USPS.php Class Class source

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