<P> Coordinates : 47 ° 00 ′ 01 '' N 109 ° 45 ′ 04 '' W ﻿ / ﻿ 47.00028 ° N 109.75111 ° W ﻿ / 47.00028 ; - 109.75111 ﻿ ( State 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 . </P>
<P> Coordinates : 47 ° 00 ′ 01 '' N 109 ° 45 ′ 04 '' W ﻿ / ﻿ 47.00028 ° N 109.75111 ° W ﻿ / 47.00028 ; - 109.75111 ﻿ ( State 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 . </P>
where is area code 406 located in usa
where is area code 406 located in usa
Montana
Montana