| 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 |
|---|---|---|---|
| 406-265 | Havre | Hill | Landline |
| 406-252 | Billings | Yellowstone | Landline |
| 406-228 | Glasgow | Valley | Landline |
| 406-335 | Sweet Grass | Toole | Landline |
| 406-567 | Denton | Fergus | Landline |
| 406-584 | Lindsay | Dawson | Landline |
| 406-352 | Box Elder | Hill | Landline |
| 406-656 | Billings | Yellowstone | Landline |
| 406-834 | Jackson | Beaverhead | Landline |
| 406-301 | Malta | Phillips | Wireless |
| 406-954 | Roy | Fergus | Wireless |
| 406-417 | Helena | Lewis And Clark | Wireless |
| 406-653 | Wolf Point | Roosevelt | Landline |
| 406-684 | Silver Star | Madison | Landline |
| 406-829 | Missoula | Missoula | Landline |
| 406-931 | Big Timber | Sweet Grass | Wireless |
| 406-879 | Havre | Hill | Wireless |
| 406-452 | Great Falls | Cascade | Landline |
| 406-664 | Belfry | Carbon | Landline |
| 406-331 | Roundup | Musselshell | Wireless |