Your billing zip code, or credit card postal code, is the five-digit number on the bottom right, which in this sample is 90210. This would be the zip code associated with your billing address. It ...

The zip code of your credit card is most the zip code of your living area or the code of the place where you have issued the card. It is also present on your credit card statement bill.

A validation code—also known as a CVV, CV2, or CVV2 code—is a series of three or four numbers located on the front or back of a credit card.

"Users simply capture (a) name from the credit-card swipe and request a customer's ZIP code during the transaction," direct marketer Harte-Hanks says in a brochure promoting its GeoCapture service.