Farson is a census-designated place (CDP) in Sweetwater County, Wyoming, United States. The population was 313 at the 2010 census. According to the United States Census Bureau, the CDP has a total area of 77.8 square miles (201.4 km²), of which, 75.4 square miles (195.4 km²) of it is land and 2.3 square miles (6.1 km²) of it (3.02%) is water.
Farson lies at the intersection of US 191 and Wyoming Highway 28 (the South Pass Highway). It is 40 miles north of Rock Springs and about 45 miles southwest of South Pass.