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Marketing. The data is often used in direct mail marketing campaigns in a process called ZIP-code marketing.

Fun Geography Facts About ZIP Codes The lowest ZIP Code number is 00501 which is designated for the Internal Revenue Service in Holtsville, New York.

The ZIP code 00001 is one of more than 42,000 five-digit ZIP Codes in the United States. ZIP area 00001 is located in the Dillingham Census Area, state of Alaska.

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.

These digits signify a small delivery area (e.g., street, city block, PO box). ZIP+4 codes are not mandatory and are usually assigned automatically at the mail sorting centers. Therefore, if you want to send a letter, a basic ZIP code will be enough for a post office to complete the delivery.

Zoning Improvement Plan (ZIP) codes were implemented in 1963. The five-digit system used the first number to point to a national area, the next two numbers to pinpoint a population centre or large city, and the final two numbers to designate a specific delivery area.

The ZIP Code Boundary Review Process requires any municipality or community group seeking a ZIP code change to submit the request in writing to the USPS district manager who is responsible for the area along with any rationale and justification.

?the five-digit ZIP number is a structured code in which the first digit identifies one of ten large areas of the Nation, and the second digit indicates a State, a geographic portion of a heavily populated State, or two or more less populated States.