The United States Postal Service has a search portal that shows towns where post offices are located. Enter the ZIP code, restrict the search area to one or five miles, and then press or click "Search."
As examples, entering the 08350 ZIP code returns the town of Richland, New Jersey. Arnaudville, Louisiana, is found by entering "70512." The search portal also enables a search for a ZIP code by municipality. Enter the municipality, and then press or click "Search" to receive the ZIP code. Both searches return information about a post office's operating and lobby hours as well as facilities such as parking.