zip code

or ZIP code, Zip code

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a system used in the U.S. to facilitate the delivery of mail, consisting of a five- or nine-digit code printed directly after the address, the first five digits (initial code ) indicating the state and post office or postal zone, the last four (expanded code ) the box section or number, portion of a rural route, building, or other specific delivery location.



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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Origin of zip code

1960–65, Americanism;Z(one)I(mprovement)P(rogram)

Definition for zip code (2 of 2)


or ZIP-code, Zip-code

[ zip-kohd ]
/ ˈzɪpˌkoʊd /

verb (used with object), zip-cod·ed, zip-cod·ing.

to provide or mark with a zip code: Zip-code all mail.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for zip code

British Dictionary definitions for zip code

zip code


the US equivalent of postcode

Word Origin for zip code

C20: from z (one) i (mprovement) p (lan)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012