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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.

ZIP Code™ validation Matches a valid ZIP Code™ in the USPS® postal data file. The ZIP Code™ in the address accurately refers to the city or town listed in the address. The address follows the correct ZIP Code™ format, including the ZIP + 4®

If the zip check has failed, it's because the bank/credit company is telling us that the zip code does not match the one it has on file. If the cardholder has recently moved, it may take their bank a while to have the correct zip code on file for them.

Also called “plus-four codes”, “add-on codes”, or “add-ons”, the ZIP+4 code starts with the standard five-digit ZIP Code. The four extra numbers are added after a hyphen to complete the ZIP+4. So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas.

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. The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits.

To validate a zip code: Use the RegExp. test() method to check for a regular expression. The regular expression should check if the value consists of 5 digits or 5 digits followed by a hyphen and 4 digits. If the condition is met, the zip code is valid.

When it comes to USA zip codes, they are always 5 digits long. However, sometimes these codes may also include leading zeros. If you store these zip codes as integers, any leading zeros would be stripped, resulting in missing data. As such, it's usually better to store zip codes as 5 character strings.