Sweetwater County was created on December 17, 1867.[4]
Geography
According to the US Census Bureau, the county has a total area of 10,491 square miles (27,170 km2), of which 10,427 square miles (27,010 km2) is land and 64 square miles (170 km2) (0.6%) is water.[5] It is the largest county in Wyoming by area.