| General Information about Area Code 307 | |
|---|---|
| Country | United States |
| State / Province / Territory | Wyoming |
| Major City | Cheyenne |
| Time Zone | Mountain (UTC-07:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 307-664 | Deaver | Big Horn | Landline |
| 307-719 | Buffalo | Johnson | Wireless |
| 307-674 | Sheridan | Sheridan | Landline |
| 307-675 | Sheridan | Sheridan | Landline |
| 307-634 | Cheyenne | Laramie | Landline |
| 307-870 | Green River | Sweetwater | Wireless |
| 307-288 | Evanston | Uinta | Landline |
| 307-259 | Shirley Basin | Carbon | Wireless |
| 307-315 | Casper | Natrona | Landline |
| 307-455 | Dubois | Fremont | Landline |
| 307-260 | Big Piney | Sublette | Wireless |
| 307-631 | Cheyenne | Laramie | Wireless |
| 307-213 | Cody | Park | Landline |
| 307-348 | Hanna | Carbon | Landline |
| 307-670 | Gillette | Campbell | Wireless |
| 307-688 | Gillette | Campbell | Landline |
| 307-740 | Jackson | Teton | Wireless |
| 307-977 | Laramie | Albany | Wireless |
| 307-248 | Afton | Lincoln | Wireless |
| 307-705 | Rock Springs | Sweetwater | Wireless |