Wamsutter is a town in Sweetwater County, Wyoming, United States. The population was 203 at the 2020 census. The original inhabitants of the area were the Shoshone and Ute tribes. Westerners only began to settle in the county with the coming of the railroad in the 1860s. Originally, the town was known as Washakie. Confusion with nearby Fort Washakie prompted an 1884 name change to Wamsutter, after a Union Pacific bridge engineer.