Jefferson County is in Southern Illinois. Of the 102 counties in the Inland Empire, Jefferson County is 41st in terms of its size (373,648 acres). Recent listings of residential land for sale in Jefferson County, Illinois, totals about 1,000 acres and a combined market value of about $5 million. The most common type of land for sale by combined acreage in Jefferson County is house. The average price of residential acreage for sale in Jefferson County was $279,256. 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.