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• zip code
  zip code

  noun

  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.
• zip-code
  zip-code

  verb (used with object)

  to provide or mark with a zip code.

zip code

¹ American  

Or ZIP code,

noun

1. 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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zip-code ² American  

[zip-kohd] / ˈzɪpˌkoʊd /

Or ZIP-code,

verb (used with object)

zip-coded, zip-coding

1. to provide or mark with a zip code.

   Zip-code all mail.

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zip code British  

noun

1. the US equivalent of postcode

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Etymology

Origin of zip code

An Americanism first recorded in 1960–65, Z(one) I(mprovement) P(rogram)