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A ZIP Code is a five digit numeric code that identifies a collection of mailing addresses within the United States and its territories to simplify the distribution of mail by the United States Postal Service (USPS). A ZIP Code is a delivery sort sequence and the USPS does not associate an area with each ZIP Code.

Most of the postal code systems are numeric; only a few are alphanumeric (i.e., use both letters and digits). Alphanumeric systems can, given the same number of characters, encode many more locations.

Zip codes are always 5 characters, hence you would need a CHAR datatype, rather than VARCHAR. The first takes 5 bytes per zip code.

There are four primary types of ZIP codes: PO Box, Unique, Military, and Standard. There are also additional types of ZIP codes as Non unique, Unique Organization. Definition of these ZIP codes is as described in their type.

There are three main parts of the 5-digit ZIP Codethe national area, the region or city, and the delivery area. The United States Postal Service (USPS) has segmented the country into 10 ZIP Code 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.

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 address you are mailing to should be written as follows: Recipient's name. Business's name (if applicable) Street address (with apartment or suite number) City, State and ZIP code (on the same line) Country

As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone. The first number of the five-digit code signifies the region which the address is located in, a number that grows from the east coast to the west.

You are right that the United States Postal Service writes ZIP Code with a capital Cand ZIP in all caps. You're also right about us. Though CMOS doesn't specifically rule on how to capitalize the term, it has rendered it as zip code (all lowercase) since it first appeared in the Manual in 1982 (in the 13th ed.).