Most Americans know their ZIP code by heart. They type it into online forms, scribble it on envelopes and memorize it as part ...

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 ...

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

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.

Mr. ZIP, informally "Zippy", was a cartoon character used in the 1960s by the United States Post Office Department, and later by its successor, the United States Postal Service, to encourage the ...