Madison County is in Southwest Illinois. Of the 102 counties in the Prairie State, Madison County is 20th in terms of its size (473,950 acres). Illinois's Madison County has roughly 1,000 acres of residential land and property for sale based on recent Land Network data. The combined market value of farms, hunting land and other rural land and acreage for sale here was nearly $82 million. The average price of residential acreage for sale in Madison County was $369,562. 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.