Sweetwater County, Wyoming

Sweetwater County is a county in southwestern Wyoming, United States. As of the 2020 United States census, the population was 42,272, making it the fourth-most populous county in Wyoming. Its county seat is Green River. By area, it is the largest county in Wyoming. Its southern boundary line abuts the north lines of the states of Colorado and Utah. Sweetwater County comprises the Rock Springs, Green River, Wyoming Micropolitan Statistical Area.