| 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 |
|---|---|---|---|
| 406-374 | Moore | Fergus | Landline |
| 406-445 | Roberts | Carbon | Landline |
| 406-771 | Great Falls | Cascade | Landline |
| 406-343 | Wyola | Big Horn | Landline |
| 406-588 | Plevna | Fallon | Landline |
| 406-245 | Billings | Yellowstone | Landline |
| 406-446 | Red Lodge | Carbon | Landline |
| 406-432 | Lothair | Liberty | Landline |
| 406-430 | Helena | Lewis And Clark | Landline |
| 406-975 | Ekalaka | Carter | Wireless |
| 406-687 | Glendive | Dawson | Landline |
| 406-585 | Bozeman | Gallatin | Landline |
| 406-928 | Grass Range | Fergus | Wireless |
| 406-785 | Fort Peck | Valley | Landline |
| 406-858 | Kalispell | Flathead | Landline |
| 406-595 | Bozeman | Gallatin | Wireless |
| 406-258 | Missoula | Missoula | Landline |
| 406-788 | Great Falls | Cascade | Wireless |
| 406-276 | Lima | Beaverhead | Landline |
| 406-841 | Helena | Lewis And Clark | Landline |