| 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 |
|---|---|---|---|
| 307-259 | Natrona | Casper, WY | Cellco Partnership DBA Verizon Wireless |
| 307-260 | Sublette | Big Piney, WY | Union Telephone Company |
| 307-261 | Carbon | Casper, WY | Qwest Corporation |
| 307-262 | Natrona | Casper, WY | Cellco Partnership DBA Verizon Wireless |
| 307-264 | Teton | Jackson, WY | Bresnan Broadband Of Wyoming |
| 307-265 | Carbon | Casper, WY | Qwest Corporation |
| 307-266 | Carbon | Casper, WY | Qwest Corporation |
| 307-267 | Natrona | Casper, WY | New Cingular Wireless PCS |
| 307-268 | Carbon | Casper, WY | Qwest Corporation |
| 307-269 | Platte | Wheatland, WY | Level 3 Communications |
| 307-270 | Lincoln | Cokeville, WY | Union Telephone Company |
| 307-271 | Park | Powell, WY | Level 3 Communications |
| 307-272 | Park | Cody, WY | Cellco Partnership DBA Verizon Wireless |
| 307-273 | Sweetwater | Farson, WY | Centurytel Of Wyoming DBA Centurylink |
| 307-274 | Laramie | Cheyenne, WY | Mcimetro Access Transmission Services LLC |
| 307-275 | Laramie | Cheyenne, WY | Cellco Partnership DBA Verizon Wireless |
| 307-276 | Sublette | Big Piney, WY | Centurytel Of Wyoming DBA Centurylink |
| 307-277 | Natrona | Casper, WY | Cellco Partnership DBA Verizon Wireless |
| 307-278 | Johnson | Buffalo, WY | Level 3 Communications |
| 307-279 | Lincoln | Cokeville, WY | All West Communications - Wyoming |
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.