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  5. Area Code 307

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.

Map of  with area code 307 highlighted

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.

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This page was last updated on July 3, 2015.