Montana Dialing Codes, Country Codes and Area Codes
| City | Country Codes | Area Codes | Dialing Codes |
|---|---|---|---|
| Billings | +1 | 406 | +1 406 |
| Bozeman | +1 | 406 | +1 406 |
| Great Falls | +1 | 406 | +1 406 |
| Helena | +1 | 406 | +1 406 |
| Missoula | +1 | 406 | +1 406 |
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