Keyword Analysis & Research: montana abbreviation 2 letter state

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When did state abbreviations become 2 letters?

Modern two-letter abbreviated codes for the states and territories originated in October 1963, with the issuance of Publication 59: Abbreviations for Use with ZIP Code, three months after the Post Office introduced ZIP codes in July 1963.

What is the state code of Montana?

Area code 406 is the telephone area code covering the entire state of Montana. It has been Montana's area code since area codes were created in 1947.

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