Where Is Area Code 307?
Area code 307 is found in the US state of Wyoming. Servicing the entire state, area code 307 includes the city of Cheyenne (population: 88863), and all 23 counties of Wyoming.
Located in the Mountain time zone, area code 307 is on the same time as Phoenix, AZ.
Area code 307 was brought into effect on January 1, 1947.
Counties in Area Code 307
- Albany,
- Big Horn,
- Campbell,
- Carbon,
- Converse,
- Crook,
- Fremont,
- Goshen,
- Hot Springs,
- Johnson,
- Laramie,
- Lincoln,
- Natrona,
- Niobrara,
- Park,
- Platte,
- Sheridan,
- Sublette,
- Sweetwater,
- Teton,
- Uinta,
- Washakie,
- Weston.
Most Populous Cities in Area Code 307
| City | County | City Population | Time Zone |
|---|---|---|---|
| Cheyenne | Laramie | 88,863 | MST |
| Casper | Natrona | 71,910 | MST |
| Gillette | Campbell | 43,428 | MST |
| Laramie | Albany | 36,322 | MST |
| Rock Springs | Sweetwater | 28,903 | MST |
| Sheridan | Sheridan | 24,962 | MST |
| Riverton | Fremont | 19,885 | MST |
| Jackson | Teton | 16,134 | MST |
| Cody | Park | 15,275 | MST |
| Evanston | Uinta | 14,551 | MST |
| Lander | Fremont | 13,867 | MST |
| Green River | Sweetwater | 13,558 | MST |
| Powell | Park | 11,944 | MST |
| Torrington | Goshen | 10,533 | MST |
| Douglas | Converse | 9,713 | MST |
| Rawlins | Carbon | 9,452 | MST |
| Worland | Washakie | 7,803 | MST |
| Buffalo | Johnson | 7,625 | MST |
| Wheatland | Platte | 6,535 | MST |
| Newcastle | Weston | 5,360 | MST |
| Pinedale | Sublette | 5,087 | MST |
| Thermopolis | Hot Springs | 4,706 | MST |
| Afton | Lincoln | 4,272 | MST |
| Glenrock | Converse | 4,188 | MST |
| Evansville | Natrona | 4,147 | MST |
Note: The above list is based off of the top 25 most populous cities in the area code as per 2012 United States Census Bureau estimates.
View all United States Area Codes.
This page was last updated on July 3, 2015.