Postal and Traditional State Abbreviations Reference Guide
https://www.thoughtco.com/state-abbreviations-1691753
WebJan 24, 2020 · In 1987, the Secretary of Commerce switched to the more commonly used two-letter postal code abbreviations. If you follow the older practice, be consistent in your use of the traditional abbreviations, and remember that eight states (Alaska, Hawaii, Idaho, Iowa, Maine, Ohio, Texas, and Utah) are only rarely abbreviated when using the older …
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