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Montana Area Codes
Montana has 1 area code in service: 406.
Largest cities
| City | Area codes |
|---|---|
| Billings | 406 |
| Missoula | 406 |
| Great Falls | 406 |
| Bozeman | 406 |
| Butte-Silver Bow | 406 |
| Helena | 406 |
| Kalispell | 406 |
| Belgrade | 406 |
| Anaconda-Deer Lodge County | 406 |
| Helena Valley Southeast | 406 |
| Whitefish | 406 |
| Livingston | 406 |
All area codes in Montana
| Code | Main cities | Overlay | In service since | Projected exhaust |
|---|---|---|---|---|
| 406 | Billings, Missoula, Great Falls, Bozeman | — | 1947 | 2033 |
754 prefixes are in use across Montana. Exhaust years are NANPA's 2026 forecast.