| 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 |
|---|---|---|---|
| 406-221 | Silver Bow | Butte, MT | AT&T Local |
| 406-222 | Park | Livingston, MT | Qwest Corporation |
| 406-223 | Park | Livingston, MT | Cellco Partnership DBA Verizon Wireless |
| 406-224 | Park | Livingston, MT | Cellco Partnership DBA Verizon Wireless |
| 406-225 | Jefferson | Boulder, MT | Qwest Corporation |
| 406-226 | Flathead | Essex, MT | Qwest Corporation |
| 406-227 | Lewis And Clark | East Helena, MT | Qwest Corporation |
| 406-228 | Valley | Glasgow, MT | Nemont Telephone Cooperative |
| 406-229 | Park | Livingston, MT | New Cingular Wireless PCS |
| 406-230 | Valley | Glasgow, MT | Cellco Partnership DBA Verizon Wireless |
| 406-231 | Cascade | Great Falls, MT | New Cingular Wireless PCS |
| 406-232 | Custer | Miles City, MT | Qwest Corporation |
| 406-233 | Custer | Miles City, MT | Qwest Corporation |
| 406-234 | Custer | Miles City, MT | Mid-rivers Telephone Cooperative |
| 406-235 | Lewis And Clark | Wolf Creek, MT | Qwest Corporation |
| 406-236 | Cascade | Neihart, MT | 3 Rivers Telephone Cooperative |
| 406-237 | Yellowstone | Billings, MT | Qwest Corporation |
| 406-238 | Yellowstone | Billings, MT | Qwest Corporation |
| 406-239 | Missoula | Missoula, MT | New Cingular Wireless PCS |
| 406-240 | Missoula | Missoula, 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.