ZIP Code Vs. Postal Code ZIP codes are five-digit numbers (sometimes nine) that identify geographic regions for delivering mail in the U.S., such as the famous 90210 in Beverly Hills, California.

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.

The House passed two bills Monday night that would authorize the U.S. Postal Service to create 76 new ZIP codes for communities nationwide.  These ...

City's street addresses are scattered across ZIP codes in four other towns, causing tax confusion and emergency response ...