Area code 406, Telephone prefix in Montana, United States.
This prefix covers all telephone numbers in Montana, linking major centers such as Bozeman, Great Falls and Helena with isolated ranches and mountain villages. The numbering area reaches communities along the Canadian border as well as settlements near Wyoming and Idaho.
When established in 1947, Montana was among 86 original areas in the North American numbering plan. The choice of a low middle digit reflected dialing habits on rotary phones at the time.
Montana residents recognize 406 as their state's exclusive area code, integrating this number into local identity across diverse Native American territories and modern settlements.
When calling numbers in Montana, always dial ten digits including the prefix, even for local calls within the same town. This method has been standard nationwide for some years and simplifies dialing everywhere.
Only eleven US states still use a single code for their entire territory today. Montana is among them, even though the state covers a larger area than Germany.
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