| Area Code | 307 |
| State | Wyoming |
| Current Time in Area Code 307 | 307> MDT |
| Timezone | Mountain Daylight Time |
| Regional Market Area | Billings Area Casper-Riverton Area Cheyenne-Laramie-Scottsbluff Area Idaho Falls-Pocatello Area Metro Salt Lake City Rapid City Area |
| Metro Area(s) | Casper, WY Cheyenne, WY Evanston, WY Gillette, WY Jackson, WY-ID Laramie, WY Riverton, WY Rock Springs, WY Sheridan, WY |
| Population (2020) | 576851 |
| Adjacent Area Codes | 208,308,406,435,605,970 |