| 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 |
|---|---|---|---|
| 307-713 | Teton | Jackson, WY | Union Telephone Company |
| 307-714 | Fremont | Lander, WY | Union Telephone Company |
| 307-715 | Goshen | Torrington, WY | Union Telephone Company |
| 307-716 | Park | Powell, WY | Union Telephone Company |
| 307-717 | Converse | Douglas, WY | Union Telephone Company |
| 307-718 | Washakie | Worland, WY | Union Telephone Company |
| 307-719 | Johnson | Buffalo, WY | Union Telephone Company |
| 307-720 | Platte | Wheatland, WY | Union Telephone Company |
| 307-721 | Albany | Laramie, WY | Qwest Corporation |
| 307-722 | Hot Springs | Thermopolis, WY | Union Telephone Company |
| 307-723 | Lincoln | Kemmerer, WY | Union Telephone Company |
| 307-724 | Natrona | Casper, WY | Union Telephone Company |
| 307-727 | Lincoln | Kemmerer, WY | Union Telephone Company |
| 307-728 | Fremont | Shoshoni, WY | Union Telephone Company |
| 307-730 | Teton | Jackson, WY | Union Telephone Company |
| 307-731 | Big Horn | Lovell, WY | Union Telephone Company |
| 307-732 | Teton | Jackson, WY | Qwest Corporation |
| 307-733 | Teton | Jackson, WY | Qwest Corporation |
| 307-734 | Teton | Jackson, WY | Qwest Corporation |
| 307-735 | Platte | Glendo, WY | Qwest Corporation |
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.