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 ...

ZIP codes are five-digit numbers, such as the famous 90210. Why credit card postal codes and ZIP codes matter Your postal code or ZIP code acts as a security measure.

Today's debit and credit cards include a verification or security code. This is a four-digit code printed on the front of American Express cards and a three-digit version on the back of MasterCard ...

A 2011 analysis for the California Judiciary Committee explained that credit card companies provided financial incentives to use ZIP code verification at the pump.