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The official name is Internal Revenue Service, not U.S. Internal Revenue Service. |
While the ZIP code is an American term, it is best to add that the Philippines uses this for clarification. |
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[[File:USA-Stamp-1973-ZIPCode.jpg|thumb|A 1974 postage stamp encouraging people to use the ZIP Code on letters and parcels]]
A '''ZIP Code''' (an acronym for '''Zone Improvement Plan'''<ref>{{cite web |title=Flashing Across the Country: Mr. Zip and the ZIP Code Promotional Campaign |url=https://postalmuseum.si.edu/flashing-across-the-country |publisher=Smithsonian National Postal Museum |access-date=30 May 2023 |first=Abby |last=Curtin |archive-date=May 30, 2023 |archive-url=https://web.archive.org/web/20230530154715/https://postalmuseum.si.edu/flashing-across-the-country |url-status=live }}</ref>) is a system of [[postal code]]s used by the [[United States Postal Service]] (USPS). The term ''ZIP'' was chosen to suggest that the [[mail]] travels more efficiently and quickly<ref>{{Cite web|url=https://www.uspsoig.gov/sites/default/files/document-library-files/2015/rarc-wp-13-006_0.pdf|title=The Untold Story of the ZIP Code|date=April 1, 2013|website=U.S. Postal Service Office of Inspector General|access-date=March 11, 2020|quote=When Day unveiled the nationwide 5-digit ZIP Code at a postmasters’ convention in October of 1962, he simultaneously introduced the world to "Mr. ZIP" — the cartoon character whose body language symbolizes speedy delivery.|archive-date=December 29, 2016|archive-url=https://web.archive.org/web/20161229123814/https://www.uspsoig.gov/sites/default/files/document-library-files/2015/rarc-wp-13-006_0.pdf|url-status=dead}}</ref> ([[wikt:zip#Verb|zipping along]]) when senders use the code in the [[Address (geography)|postal address]]. The [[Philippine Postal Corporation]] also uses this terminology for the [[ZIP codes in the Philippines|postal code system]] in the [[Philippines]].<ref>{{Citation |title=ZIP Code Locator |url=https://phlpost.gov.ph/zip-code-locator/ |website=PhlPost |access-date=29 February 2020}}</ref>
Introduced on July 1, 1963, the basic format comprised five digits.<ref>{{Cite web |last=Terrell |first=Ellen |title=This Month in Business History: ZIP Code Introduced |url=https://guides.loc.gov/this-month-in-business-history/july/zip-code-introduced |access-date=2022-07-31 |website=Library of Congress Research Guides |language=en |date=June 28, 2013 |archive-date=October 29, 2021 |archive-url=https://web.archive.org/web/20211029214050/https://guides.loc.gov/this-month-in-business-history/july/zip-code-introduced |url-status=live }}</ref> 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.
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