| District of Montana area codes: 406 | |
|---|---|
| Country | United States |
| State/Province | Montana |
| Major City | Billings |
| Time Zone | Mountain (UTC-07:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 406-261 | Flathead | Kalispell, MT | New Cingular Wireless PCS |
| 406-262 | Hill | Havre, MT | Qwest Corporation |
| 406-263 | Valley | Glasgow, MT | Sagebrush Cellular |
| 406-264 | Cascade | Fort Shaw, MT | 3 Rivers Telephone Cooperative |
| 406-265 | Hill | Havre, MT | Qwest Corporation |
| 406-266 | Broadwater | Townsend, MT | Qwest Corporation |
| 406-267 | Silver Bow | Divide, MT | Southern Montana Telephone Co. |
| 406-268 | Cascade | Great Falls, MT | Qwest Corporation |
| 406-269 | Mineral | St Regis, MT | New Cingular Wireless PCS |
| 406-270 | Flathead | Kalispell, MT | Cellco Partnership DBA Verizon Wireless |
| 406-271 | Pondera | Conrad, MT | 3 Rivers Telephone Cooperative |
| 406-272 | Yellowstone | Billings, MT | Zayo Group LLC |
| 406-273 | Missoula | Lolo, MT | Qwest Corporation |
| 406-274 | Missoula | Missoula, MT | AT&T Local |
| 406-275 | Lake | Ronan, MT | Ronan Telephone Co. |
| 406-276 | Beaverhead | Lima, MT | 3 Rivers Telephone Cooperative |
| 406-277 | Cascade | Belt, MT | 3 Rivers Telephone Cooperative |
| 406-278 | Pondera | Conrad, MT | Qwest Corporation |
| 406-279 | Pondera | Valier, MT | 3 Rivers Telephone Cooperative |
| 406-280 | Mineral | St Regis, MT | New Cingular Wireless PCS |
There are 696 prefixes, In the code area, the major cities are Billings, MT;Bozeman, MT;Butte-silver Bow, MT;Grea. The major city is Billings.