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expanded code

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noun
  1. See under zip code.
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zip code

or ZIP code, 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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Origin of zip code

1960–65, Americanism; Z(one) I(mprovement) P(rogram)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for expanded code

zip code

noun
  1. the US equivalent of postcode
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Word Origin

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