Area code 406
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Area code 406 is the telephone area code serving all of the state of Montana.
| State of Montana area code: 406 | ||
|---|---|---|
| North: 403, 250, 306 | ||
| West: 208 | 406 | East: 605, 701 |
| South: 208, 307 | ||
| State of Idaho Area Code: 208 | ||
| State of North Dakota area code: 701 | ||
| State of South Dakota area code: 605 | ||
| State of Wyoming area code: 307 | ||
| Province of British Columbia Area Codes: 250, 604, 778 | ||
| Province of Alberta Area codes: 403, 780 | ||
