| 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 |
|---|---|---|---|
| 307-321 | Carbon | Rawlins, WY | Cellco Partnership DBA Verizon Wireless |
| 307-322 | Platte | Wheatland, WY | Qwest Corporation |
| 307-324 | Carbon | Rawlins, WY | Qwest Corporation |
| 307-325 | Carbon | Hanna, WY | Union Telephone Co. |
| 307-326 | Carbon | Encampment, WY | Union Telephone Co. |
| 307-327 | Carbon | Encampment, WY | Union Telephone Co. |
| 307-328 | Carbon | Rawlins, WY | Qwest Corporation |
| 307-329 | Carbon | Encampment, WY | Union Telephone Company |
| 307-330 | Fremont | Lander, WY | Union Telephone Company |
| 307-331 | Platte | Wheatland, WY | Cellco Partnership DBA Verizon Wireless |
| 307-332 | Fremont | Lander, WY | Qwest Corporation |
| 307-333 | Natrona | Casper, WY | Bresnan Broadband Of Wyoming |
| 307-334 | Niobrara | Manville, WY | Qwest Corporation |
| 307-335 | Fremont | Lander, WY | Qwest Corporation |
| 307-337 | Natrona | Casper, WY | Bresnan Broadband Of Wyoming |
| 307-338 | Goshen | Torrington, WY | Cellco Partnership DBA Verizon Wireless |
| 307-339 | Carbon | Hanna, WY | Union Telephone Company |
| 307-340 | Niobrara | Manville, WY | Cellco Partnership DBA Verizon Wireless |
| 307-341 | Sheridan | Parkman, WY | Project Telephone Co. |
| 307-343 | Albany | Laramie, WY | Cellco Partnership DBA Verizon Wireless |
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.