ZIP Code
Numeric postal code used in the US 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.
Introduced on July 1, 1963, the basic format comprised five digits.[3] In 1983, an extended code was introduced named 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 and ZIP+4 are registered trademarks of the United States Postal Service, which also registered ZIP Code as a service mark until 1997.[4]