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The most complete ZIP Code is a nine-digit number consisting of five digits, a hyphen, and four digits, which the USPS describes by its trademark ZIP+4.

A United States postal code, for example, might be either five digits or five digits followed a hyphen (dash) and another four digits (12345-1234). If you are validating US postal codes, allow for both conditions. The following rule validates a field that can be five digits, five digits + dash + 4 digits, or blank.

To find the ZIP code on your credit card, you can log in to your online account and look for your billing address in the personal information section, or call customer service. Normally, your credit card's ZIP code will be the same as the ZIP code for your current mailing address.

A credit card ZIP code is part of the geographical identifier associated with a credit card's billing address. This will be the postal or ZIP code you provided when you applied for the card, unless you have since moved to a new address and updated your billing information.

The debit card zip code refers to a user's billing address postal code. You can not change your zip code, but you can change your password at any time. The password combination may vary depending on the banking guidelines. But the zip code will always be the same: a combination of a five-digit letter.

For example, 40202 is in Louisville, 50309 in Des Moines, 60601 in Chicago, 63101 in St. Louis, 77036 in Houston, 80202 in Denver, 94111 in San Francisco, 98101 in Seattle, and 99950 in Ketchikan, Alaska (the highest ZIP Code).

The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits. The first five digits represent the 5-digit ZIP Code; the sixth and seventh digits (the first two after the hyphen) identify an area known as a sector; the eighth and ninth digits identify a smaller area known as a segment.