ZIP Code

Numeric postal code used in the United States and its territories / From Wikipedia, the free encyclopedia

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A ZIP Code (an acronym for Zone Improvement Plan[1]) is a system of postal codes used by the United States Postal Service (USPS). The term ZIP was chosen to suggest that the mail travels more efficiently and quickly[2] (zipping along) when senders use the code in the postal address.

USA-Stamp-1973-ZIPCode.jpg
A 1974 postage stamp encouraging people to use the ZIP Code on letters and parcels

Introduced on July 1, 1963, the basic format consisted of five digits.[3] In 1983, an extended code was introduced, called ZIP+4 ; it included the five digits of the ZIP Code, followed by a hyphen and four digits that designated a more specific location.

ZIP Code is a trademark and ZIP+4 is a registered trademark of the United States Postal Service, which also registered ZIP Code as a service mark until 1997.[4]

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