Clinton County is in Southern Illinois. Of the 102 counties in the Prairie State, 322,052-acre Clinton County ranks 55th by size. Illinois's Clinton County has nearly 1,000 acres of residential land for sale based on recent Land Network data. The combined market value of farms, rural land, hunting land and other land for sale here was roughly $4 million. The average price of residential acreage for sale in Clinton County was $253,139. 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.