| General Information about Area Code 406 | |
|---|---|
| Country | United States |
| State / Province / Territory | Montana |
| Major City | Billings |
| Time Zone | Mountain (UTC-07:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 406-775 | Ekalaka | Carter | Landline |
| 406-310 | Butte | Silver Bow | Wireless |
| 406-782 | Butte | Silver Bow | Landline |
| 406-494 | Butte | Silver Bow | Landline |
| 406-813 | Belgrade | Gallatin | Landline |
| 406-576 | Conrad | Pondera | Wireless |
| 406-227 | Helena | Lewis And Clark | Landline |
| 406-926 | Missoula | Missoula | Landline |
| 406-392 | Frazer | Valley | Landline |
| 406-859 | Philipsburg | Granite | Landline |
| 406-620 | Billings | Yellowstone | Wireless |
| 406-756 | Kalispell | Flathead | Landline |
| 406-369 | Hamilton | Ravalli | Wireless |
| 406-843 | Virginia City | Madison | Landline |
| 406-905 | Joliet | Carbon | Landline |
| 406-978 | Baker | Fallon | Wireless |
| 406-720 | Ashland | Rosebud | Wireless |
| 406-878 | Great Falls | Cascade | Wireless |
| 406-247 | Billings | Yellowstone | Landline |
| 406-413 | Billings | Yellowstone | Landline |