| 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 |
|---|---|---|---|
| 406-855 | Billings | Yellowstone | Wireless |
| 406-744 | Charlo | Lake | Landline |
| 406-963 | Froid | Roosevelt | Landline |
| 406-934 | Miles City | Custer | Wireless |
| 406-696 | Billings | Yellowstone | Wireless |
| 406-837 | Bigfork | Flathead | Landline |
| 406-292 | Joplin | Liberty | Landline |
| 406-853 | Miles City | Custer | Wireless |
| 406-422 | Helena | Lewis And Clark | Landline |
| 406-981 | Miles City | Custer | Wireless |
| 406-969 | Billings | Yellowstone | Landline |
| 406-451 | Bozeman | Gallatin | Wireless |
| 406-502 | Helena | Lewis And Clark | Landline |
| 406-873 | Cut Bank | Glacier | Landline |
| 406-213 | Forsyth | Rosebud | Landline |
| 406-554 | Volborg | Custer | Landline |
| 406-984 | Birney | Rosebud | Landline |
| 406-482 | Sidney | Richland | Landline |
| 406-243 | Missoula | Missoula | Landline |
| 406-587 | Bozeman | Gallatin | Landline |