Quoc: 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.\n\nAnswer this question based on the passage: where is area code 406 located in usa?
HW Chung: OK, some thoughts:
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The relevant information is: 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. The answer is the entire state of Montana.
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