What is the full US ZIP Code format? - Geographic Pedia - NCESC
https://www.ncesc.com/geographic-pedia/what-is-the-full-us-zip-code-format/
WEBApr 2, 2024 · The basic format of a US ZIP code, introduced on July 1, 1963, consists of five digits. However, in 1983, an extended ZIP+4 code was introduced. This extended format includes the original five digits of the ZIP code, followed by a hyphen and four additional digits that indicate a more specific location within the ZIP code area.
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