| 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 |
|---|---|---|---|
| 307-200 | Teton | Jackson, WY | Level 3 Communications |
| 307-201 | Teton | Jackson, WY | Level 3 Communications |
| 307-202 | Park | Powell, WY | New Cingular Wireless PCS |
| 307-203 | Teton | Jackson, WY | Sprint Spectrum L.p. |
| 307-206 | Fremont | Lander, WY | Mcimetro Access Transmission Services LLC |
| 307-212 | Sweetwater | Rock Springs, WY | Level 3 Communications |
| 307-213 | Park | Cody, WY | Level 3 Communications |
| 307-214 | Laramie | Cheyenne, WY | Cellco Partnership DBA Verizon Wireless |
| 307-215 | Carbon | Casper, WY | AT&T Local |
| 307-216 | Niobrara | Manville, WY | New Cingular Wireless PCS |
| 307-217 | Johnson | Buffalo, WY | New Cingular Wireless PCS |
| 307-220 | Laramie | Cheyenne, WY | T-mobile Usa |
| 307-221 | Laramie | Cheyenne, WY | Sprint Spectrum L.p. |
| 307-222 | Laramie | Cheyenne, WY | Level 3 Communications |
| 307-223 | Albany | Laramie, WY | Level 3 Communications |
| 307-224 | Carbon | Casper, WY | Level 3 Communications |
| 307-228 | Bandwidth.com Clec | ||
| 307-230 | Natrona | Casper, WY | Versatel Communications |
| 307-231 | Sublette | Pinedale, WY | Cellco Partnership DBA Verizon Wireless |
| 307-232 | Carbon | Casper, 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.