What does 406 mean in US Phone Area Codes?

This page is about the meanings of the acronym/abbreviation/shorthand 406 in the Regional field in general and in the US Phone Area Codes terminology in particular.

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What does 406 mean?

Montana, Treasure State, MT(noun)
a state in northwestern United States on the Canadian border

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"406." Abbreviations.com. STANDS4 LLC, 2015. Web. 27 Feb. 2015. <http://www.abbreviations.com/term/308912>.

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