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ZIP Code

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A zip code is the postal code used by the United States Postal Service. ZIP is an acronym for zoning improvement plan. The zip code consists of five numerical digits. An extended zip+4 code includes the five digits of the zip code plus four digits which allow a piece of mail to be delivered to a specific address.

Zip codes are used not only for tracking of mail, but are also used in gathering geographical statistics in the United States.