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USA Zip Code Look Up

The USA ZIP code is the postal code system used by the United States Postal Service (USPS). The ZIP stands for Zone Improvement Plan and it is used for efficient mail travel when sender uses a code in the postal address. The basic USA Zip Code format consists of five numerical digits. An extended ZIP + 4 code was introduced for more precise location than the normal zip code. The ZIP Code was originally a registered trademark (as a service mark) by the U.S. Postal Service but that has expired.

Using this zip code look up service to look up city and state by zip code in the USA. This zip code look up service also displays the map of the zip code.

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