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There are two types of ZIP codes used in the United States: five-digit (or standard) and nine-digit (or extended). Standard ZIP codes are used in most parts of the country, while nine-digit ZIP codes are used primarily in rural areas.

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.

The first digit in a ZIP code represents a defined group of U.S. states. The second and third digits represent a region in that group, such as a large city. To send mail, only the first five digits of the ZIP code are required.

The standard ZIP code notation used by the United States Postal service uses five digits to identify a delivery area. An example of a standard US ZIP code is 90210.

Place the city, state, and ZIP Code in that order on the last line. This must be the last line. Never place an ?attention line,? telephone number, or other entries after the ZIP Code line. The ?attention line? should be placed at the top.

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 codes are a type of postal code used by the United States Postal Service to route mail. First introduced by the Post Office Department in 1963, ZIP stands for Zone Improvement Plan, and was initially established to help the USPS deliver packages. Today it is used to ship almost anything to an address.

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.