Wasson is an unincorporated community in East Eldorado and Raleigh Townships, Saline County, Illinois, United States. Wasson is located along U.S. Route 45 3 miles southwest of Eldorado. Wasson started as a company village for the Wasson Coal Company outside of Harrisburg, Illinois. The village was named after C.M. Wasson and his son. Mr. …Wasson is an unincorporated community in East Eldorado and Raleigh Townships, Saline County, Illinois, United States. Wasson is located along U.S. Route 45 3 miles southwest of Eldorado. Wasson started as a company village for the Wasson Coal Company outside of Harrisburg, Illinois. The village was named after C.M. Wasson and his son. Mr. Wasson began his career as a junk dealer and eventually became one of the leading coal mining and banking pioneers in Southern Illinois.