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United States ZIP codes are five numerical digits long. ZIP+4 codes, also known as add-on or plus-four codes, include four additional digits that identify a geographic segment within a ZIP code delivery area. The first digit in a ZIP code represents a defined group of U.S. states.

Your Canadian credit card ZIP code is the 3 numbers in your postal code followed by 00. If your credit card is declined at the gas pump, you can go to the cashier and they can put the transaction through manually.

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.

So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

Fortunately, there's an easy solution. 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. Mastercard recommends this strategy.

Place the recipient's name on the first line. On the second line, write the building number and street name. Include the city, state and ZIP code on the final line.

The first three digits before the hyphen identify the sectional center or large city. The second two classify the post office facility or delivery area. After the hyphen, the first two digits indicate the sector or group of blocks, and the last two identify the segment or one side of a street.