On July 1, 1963, the U.S. Post Office Department introduced the ZIP code program to get a handle on the heaping surplus of mail. Today, those five digits represent much more for American society. Back ...

The Corona del Mar post office celebrated a once-in-a-century occurrence when the date matched its ZIP code on Friday.

Mail theft in Seattle reportedly forced the United States Postal Service to pause deliveries for an entire ZIP code to pause this month, according to local reports. The Postal Service announced mail ...