| 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 |
|---|---|---|---|
| 307-233 | Carbon | Casper, WY | Qwest Corporation |
| 307-234 | Carbon | Casper, WY | Qwest Corporation |
| 307-235 | Carbon | Casper, WY | Qwest Corporation |
| 307-237 | Carbon | Casper, WY | Qwest Corporation |
| 307-240 | Fremont | Riverton, WY | Cellco Partnership DBA Verizon Wireless |
| 307-241 | Platte | Wheatland, WY | New Cingular Wireless PCS |
| 307-242 | Teton | Yellowstone National Park, WY | Qwest Corporation |
| 307-245 | Laramie | Pine Bluffs, WY | Rt Communications |
| 307-246 | Laramie | Albin, WY | Rt Communications |
| 307-247 | Natrona | Casper, WY | New Cingular Wireless PCS |
| 307-248 | Lincoln | Afton, WY | Cellco Partnership DBA Verizon Wireless |
| 307-250 | Park | Cody, WY | Cellco Partnership DBA Verizon Wireless |
| 307-251 | Natrona | Casper, WY | Cellco Partnership DBA Verizon Wireless |
| 307-252 | Sweetwater | Rock Springs, WY | Uintah Basin Electronic Telecommunications |
| 307-253 | Natrona | Casper, WY | Qwest Corporation |
| 307-254 | Park | Powell, WY | Cellco Partnership DBA Verizon Wireless |
| 307-255 | Uinta | Evanston, WY | Uintah Basin Electronic Telecommunications |
| 307-256 | Laramie | Cheyenne, WY | Sprint Spectrum L.p. |
| 307-257 | Campbell | Gillette, WY | Level 3 Communications |
| 307-258 | Natrona | Casper, 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.