| 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 |
|---|---|---|---|
| 406-545 | Billings | Yellowstone | Landline |
| 406-740 | Ashland | Rosebud | Wireless |
| 406-956 | Baker | Fallon | Wireless |
| 406-875 | Worden | Yellowstone | Landline |
| 406-654 | Malta | Phillips | Landline |
| 406-833 | Ronan | Lake | Wireless |
| 406-862 | Whitefish | Flathead | Landline |
| 406-631 | Elmo | Lake | Landline |
| 406-929 | Whitefish | Flathead | Landline |
| 406-493 | Missoula | Missoula | Landline |
| 406-896 | Billings | Yellowstone | Landline |
| 406-747 | Sidney | Richland | Landline |
| 406-861 | Billings | Yellowstone | Wireless |
| 406-522 | Bozeman | Gallatin | Landline |
| 406-942 | Glasgow | Valley | Wireless |
| 406-670 | Billings | Yellowstone | Wireless |
| 406-396 | Missoula | Missoula | Wireless |
| 406-882 | Eureka | Lincoln | Landline |
| 406-889 | Eureka | Lincoln | Landline |
| 406-518 | Bozeman | Gallatin | Landline |