| 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 |
|---|---|---|---|
| 406-488 | Sidney | Richland | Landline |
| 406-591 | Billings | Yellowstone | Wireless |
| 406-222 | Livingston | Park | Landline |
| 406-863 | Whitefish | Flathead | Landline |
| 406-847 | Noxon | Sanders | Landline |
| 406-539 | Bozeman | Gallatin | Wireless |
| 406-786 | Brockton | Roosevelt | Landline |
| 406-275 | Polson | Lake | Landline |
| 406-259 | Billings | Yellowstone | Landline |
| 406-372 | Kremlin | Hill | Landline |
| 406-871 | Kalispell | Flathead | Wireless |
| 406-962 | Joliet | Carbon | Landline |
| 406-279 | Valier | Pondera | Landline |
| 406-334 | Libby | Lincoln | Wireless |
| 406-657 | Billings | Yellowstone | Landline |
| 406-982 | Dayton | Lake | Landline |
| 406-320 | Roundup | Musselshell | Wireless |
| 406-582 | Bozeman | Gallatin | Landline |
| 406-229 | Livingston | Park | Wireless |
| 406-528 | Ronan | Lake | Landline |