| 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 |
|---|---|---|---|
| 406-431 | Helena | Lewis And Clark | Wireless |
| 406-339 | Shelby | Toole | Landline |
| 406-891 | Plevna | Fallon | Wireless |
| 406-790 | Culbertson | Roosevelt | Wireless |
| 406-541 | Missoula | Missoula | Landline |
| 406-318 | Polson | Lake | Landline |
| 406-202 | Helena | Lewis And Clark | Wireless |
| 406-399 | Box Elder | Hill | Wireless |
| 406-957 | Terry | Prairie | Wireless |
| 406-646 | West Yellowstone | Gallatin | Landline |
| 406-795 | Wibaux | Wibaux | Landline |
| 406-579 | Bozeman | Gallatin | Wireless |
| 406-844 | Lakeside | Flathead | Landline |
| 406-389 | Helena | Lewis And Clark | Landline |
| 406-284 | Manhattan | Gallatin | Landline |
| 406-739 | Loma | Chouteau | Landline |
| 406-280 | Saint Regis | Mineral | Wireless |
| 406-637 | Fallon | Prairie | Landline |
| 406-669 | Acton | Yellowstone | Landline |
| 406-971 | Plevna | Fallon | Wireless |