Area code 406
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Area code 406 is the telephone area code serving all of the state of Montana.
Billings prefixes in area code (406)-206 208 215 237 238 245 247 248 252 254 255 256 259 272 281 294 325 371 373 384 435 534 545 591 598 620 651 652 655 656 657 661 670 671 672 690 694 696 697 698 794 839 850 855 860 861 867 869 894 896
| State of Montana area code: 406 | ||
|---|---|---|
| North: 403, 250, 306 | ||
| West: 208 | 406 | East: 605, 701 |
| South: 208, 307 | ||
| Province of Alberta Area codes: 403, 780 | ||
| Province of British Columbia Area Codes: 250, 604, 778 | ||
| 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 | ||
