Clinton County is in Southern Illinois. Of the 102 counties in the Land of Lincoln, 322,052-acre Clinton County ranks 55th by size. Recent listings of residential land for sale in Illinois's Clinton County totals around 1,000 acres and a combined market value of roughly $9 million. The most common type of land for sale by combined acreage in Clinton County is house. The average price of residential acreage for sale in Clinton County was $263,840. 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.