![]() ![]() An earlier list, publicized in June 1963, had proposed capitalized abbreviations ranging from two to five letters. ![]() The USPOD issued its Publication 59: Abbreviations for Use with ZIP Code on October 1, 1963, with the list of two-letter state abbreviations which are generally written with both letters capitalized. īy the early 1960s, a more organized system was needed, and non-mandatory five-digit ZIP Codes were introduced nationwide on July 1, 1963. The "16" is the number of the postal zone in a specific city.
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