Clinton County is in Southern Illinois. Of the 102 counties in the Land of Lincoln, Clinton County is 55th in terms of its size (503 square miles). The total value of around 1,000 acres of residential land recently listed for sale in Illinois's Clinton County was approximately $5 million. The average price of residential land for sale in Clinton County was $282,702. 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.