ZIP Code

A ZIP Code is the postal code used by the United States Postal Service, which always writes it with capital letters. ZIP is an acronym for the Zoning Improvement Plan, but was also cleverly meant to suggest that mail travels more efficiently (and therefore faster) when senders use it. The basic ZIP Code format 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 Code was originally registered as a trademark by the U.S. Postal Service, but its registration has since expired.

Related Topics:
Postal code - United States Postal Service - Acronym - Mail - Trademark

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