A postal code is a five digit code used to help postal services deliver mail and packages. Here's what the numbers mean and how they determine yours.

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.

ZIP codes will remain fixed to specific geographic locations; the post office has no plans to allow Americans to take their ZIP codes with them, wherever they go. Read Seabrook's Story: ...

From sales taxes to local identity, Colorado communities say there are a lot of reasons to fight for a unique ZIP code.