Smithville is an unincorporated community and census-designated place (CDP) in Peoria County, Illinois, United States. It is in the southern part of the county, in the center of Logan Township. It is 2 miles (3 km) south of Hanna City and 13 miles (21 km) west-southwest of downtown Peoria. Smithville was first listed as a CDP prior to the 2020 census.