You can find ZIP codes on the United States Postal Service website at USPS.com. To search for a ZIP code on USPS.com, click on the Quick Tools section of the website and then choose Look Up a ZIP Code from the drop-down menu.
You can look up a ZIP code on the USPS.com website by entering any street address, city and state. Alternatively, you can generate a list of all ZIP codes within a specific city, or perform a ZIP code search by company name and address. The site provides a further option to search all cities within a particular ZIP code.