Sweetwater County, Wyoming

Sweetwater County
County
Rock Springs City Hall, 2007
Flag
Location within the U.S. state of Wyoming
Wyoming's location within the U.S.
Coordinates: 41°40′N 108°53′W / 41.66°N 108.89°W / 41.66; -108.89
Country	United States
State	Wyoming
Founded	December 17, 1867
Named for	Sweetwater River
Seat	Green River
Largest city	Rock Springs
Area
• Total	10,491 sq mi (27,170 km2)
• Land	10,427 sq mi (27,010 km2)
• Water	64 sq mi (170 km2)  0.6%
Population  (2020)
• Total	42,272
• Density	4.0/sq mi (1.6/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Area code	307
Congressional district	At-large
Website	www.sweetwatercountywy.gov

Sweetwater County is a county in southwestern Wyoming, United States.^[1] As of the 2020 United States Census, the population was 42,272, making it the fourth-most populous county in Wyoming.^[2] Its county seat is Green River.^[3] 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.