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.

The Business Journals evaluated almost 33,200 ZIP codes to compile its new wealth index. The wealthiest ZIP codes rankings are intended to capture the greatest concentrations of wealth. The rankings ...