Randolph County is in Southwest Illinois. Of the 102 counties in the state, 382,078-acre Randolph County ranks 38th by size. A recent survey of Land Network data records around 1,000 acres of residential land for sale in Illinois's Randolph County, which is valued at a combined $13 million. The average price of residential land for sale in Randolph County was $374,934. 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.