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1963.
1963: ZIP Codes are introduced. ZIP Codes are five-digit numbers that enable mail to be sorted faster. Use of the code was not mandatory on any mail at first.
http://www.zip-codes.com/united_states_zip_codes_timeline.asp
Before that we had "zones," two-digit numbers that pertained to a given area:
1943: The United States Post Office Department divides cities into zones. This was a precursor to the Zoning Improvement Plan Codes, or ZIP Codes.
In some if not all areas, the zones wound up as the last two digits of the new ZIP codes.
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