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

Leave one space between the city and state and two spaces between the state and ZIP Code™. Use black ink on white or light-colored paper. Use a PO Box™ address or street address—but not both.

Not Always. When looking at postal codes around the world, there are cases where two different cities are served by the same postal code. For example, the zip code 94608 in California is used for both Emeryville and parts of Oakland.

Conclusion. The zip code is the cardholder's identity. When you are asked to bypass the zip code during the purchase, you can simply skip it by inserting your home or office address zip code or the zip code where your card has been issued. However, you can use a different card because some cards don't require zip codes ...

Use the standard U.S. Postal Service abbreviations below for addresses, whether used in text or block address form. As a general guide, the inclusion of a ZIP code makes it an address; the omission of a ZIP code makes it a location. (See also state abbreviations.)

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.

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.