For some credit card purchases in Canada, a postal code is required as a security measure. If using a credit card in the U.S., you may need to use a ZIP code instead. Many or all of the products on ...

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 ...

What is a postal code? A postal code, also sometimes called a post code, is a series of letters and/or digits included in postal addresses to facilitate the sorting of mail. Postal codes are usually ...