Randolph County is in Southwest Illinois. Of the 102 counties in the Prairie State, Randolph County is 38th in terms of its size (596 square miles). The total value of almost 1,000 acres of residential land and property recently listed for sale in Randolph County, Illinois, was almost $5 million. The average price of residential acreage for sale in Randolph County was $283,915. Browse all residential land and rural property for sale in Illinois to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.