| District of Wyoming area codes: 307 | |
|---|---|
| Country | United States |
| State/Province | Wyoming |
| Major City | Casper |
| Time Zone | Mountain (UTC-07:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 307-857 | Fremont | Riverton, WY | Qwest Corporation |
| 307-858 | Fremont | Riverton, WY | Union Telephone Company |
| 307-859 | Sublette | Pinedale, WY | Centurytel Of Wyoming DBA Centurylink |
| 307-864 | Hot Springs | Thermopolis, WY | Rt Communications |
| 307-867 | Hot Springs | Thermopolis, WY | Tri - County Telephone Association |
| 307-868 | Park | Meeteetse, WY | Tct West |
| 307-870 | Sweetwater | Green River, WY | Union Telephone Company |
| 307-871 | Sweetwater | Green River, WY | Cellco Partnership DBA Verizon Wireless |
| 307-872 | Sweetwater | Green River, WY | Qwest Corporation |
| 307-874 | Uinta | Lonetree, WY | Union Telephone Co. |
| 307-875 | Sweetwater | Green River, WY | Qwest Corporation |
| 307-876 | Fremont | Shoshoni, WY | Rt Communications |
| 307-877 | Lincoln | Kemmerer, WY | Qwest Corporation |
| 307-878 | Crook | Hulett, WY | Range Telephone Cooperative |
| 307-880 | Lincoln | Freedom, WY | Gold Star Communications |
| 307-883 | Lincoln | Freedom, WY | Silver Star Telephone Co. |
| 307-884 | Lincoln | Afton, WY | Union Telephone Company |
| 307-885 | Lincoln | Afton, WY | Silver Star Telephone Co. |
| 307-886 | Lincoln | Afton, WY | Qwest Corporation |
| 307-887 | Lincoln | Afton, WY | Gold Star Communications |
There are 373 prefixes, In the code area, the major cities are Casper, WY;Cheyenne, WY;Gillette, WY;Laramie, WY. The major city is Casper.