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.

When you enter your billing address and ZIP code, AVS can help verify you as the cardholder. Someone using a credit card or card number fraudulently may not have access to this information.

Your credit card's security code is a three- or four-digit number that helps protect you against credit card fraud. Learn how to find it and why it's important.

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 ...