List of U.S. state and territory abbreviations - Wikipedia
https://en.wikipedia.org/wiki/List_of_U.S._state_and_territory_abbreviations
OverviewHistoryCodes for states and territoriesSee alsoExternal linksAs early as October 1831, the United States Post Office recognized common abbreviations for states and territories. However, they accepted these abbreviations only because of their popularity, preferring that patrons spell names out in full to avoid confusion. The traditional abbreviations for U.S. states and territories, widely used in mailing addresses prior to the introduction of two-letter U.S. postal abbreviations, are still commonly used for other purp…
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