Sweetwater County was organized in 1867. Nestled in a valley at the confluence of the Green River and Bitter Creek, the town of Green River is situated among some of the most famous and beautiful rock formations in the West. This stunning backdrop was the jumping-off point for John Wesley Powell's famous river explorations. The city's story is intertwined with the arteries of westward expansion. The Colorado River system, the Cherokee and Overland Trails, the Union Pacific Railroad. the Lincoln Highway, the interstate highway system, and even America’s first intergalactic Space Ports are all part of the story of Green River. After its humble start as an Overland Trail stage station, the town grew in anticipation of the arrival of the transcontinental railroad and eventually became the Sweetwater County seat. The Green River, ranching, recreation, and the chemical industry also play a part in the town's history.

The largest county in Wyoming, Sweetwater County is larger than six states and is the eighth largest county nationwide (not including boroughs and census areas in Alaska.

Incorporated Cities and Towns are those of Green River, Rock Springs, Granger, Superior, Wamsutter, and Bairoil.

If you happen to be looking for information about people who lived in Burntfork, Mckinnon, and Washum, and you do not find information in this site, look in the Daggett County Utah site, or the Uinta County Wyoming Site.