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Primary state prefixes. ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.

The two codes are essentially the same in their purpose, but the term Zip code is mainly used in the USA; Postal Code is commonly used in other countries.

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.

If prompted for your ZIP code, just enter the three digits of your postal code plus two zeros. So for example, if your postal code is A2B 3C4, the 5-digit number you should enter is 23400.

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.

ZIP & ZIP+4 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.

ZIP+4 codes, also known as Plus-Four codes, ZIP code extensions, 9 digit ZIP codes, extended ZIP codes, or full ZIP codes, are four-digit codes that are appended to the traditional five-digit USPS ZIP codes.

A 5-Digit ZIP code represents a USPS delivery area. A 9-Digit ZIP code, also known as a ZIP+4 code or an extended ZIP code, includes the same information as the 5-Digit ZIP code, plus additional information about a specific delivery route within the delivery area.