The familiar five-digit number was part of a nationwide effort to modernize the mail.

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 ...

Everyone knows the ZIP code 90210—but what about these other notable codes around the country? The Zone Improvement Plan, otherwise known as the ZIP code, is the network of postal codes the U.S.

Officials in Phillipston have requested a boundary review from the U.S. Post Office, which could result in the town receiving ...