When prompted for your ZIP code, enter the three digits from your postal code, followed by “00.” For example, if your postal code is M4B 1G5, your credit card ZIP code would be 41500.

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 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. Postal codes in Canada ...