| 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 |
|---|---|---|---|
| 406-761 | Great Falls | Cascade | Landline |
| 406-629 | Hardin | Big Horn | Wireless |
| 406-375 | Hamilton | Ravalli | Landline |
| 406-261 | Kalispell | Flathead | Wireless |
| 406-515 | Superior | Mineral | Wireless |
| 406-708 | Lewistown | Fergus | Landline |
| 406-830 | Missoula | Missoula | Landline |
| 406-583 | Bloomfield | Dawson | Landline |
| 406-266 | Townsend | Broadwater | Landline |
| 406-474 | Flaxville | Daniels | Landline |
| 406-381 | Hamilton | Ravalli | Wireless |
| 406-652 | Billings | Yellowstone | Landline |
| 406-568 | Ryegate | Golden Valley | Landline |
| 406-890 | Kalispell | Flathead | Landline |
| 406-989 | Glendive | Dawson | Wireless |
| 406-367 | Glasgow | Valley | Landline |
| 406-264 | Fort Shaw | Cascade | Landline |
| 406-634 | Helena | Lewis And Clark | Landline |
| 406-290 | Columbus | Stillwater | Landline |
| 406-529 | Missoula | Missoula | Wireless |