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Unknown, empty, or otherwise invalid integers are represented by 0. Zip codes will require leading zeros to correctly format 5-digit and zip-plus-4 codes. Zip-plus-4 notation using a plus-4 of all zeros (-0000) is not valid - use the 5-digit instead.

A 5-digit number that identifies a particular postal delivery area in the United States.

If you want to improve the chances that the letter will make it to its destination quickly, you should use the five-digit ZIP code plus the four additional numbers that are specific to the area. To format, write the ZIP code with a hyphen afterward and then the four additional numbers will immediately follow that.

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 Format Zip Code must be in the format of '#####' or '#####-####', example: '32334' or '32334-0092'.

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.

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.