Clinton County is in Southern Illinois. Of the 102 counties in the state, 322,052-acre Clinton County ranks 55th by size. The total value of about 1,000 acres of residential land and property recently listed for sale in Clinton County, Illinois, was roughly $5 million. The average price of residential land for sale in Clinton County was $327,218. 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.