Franklin County is in Southern Illinois. Of the 102 counties in the Land of Lincoln, 276,127-acre Franklin County ranks 69th by size. There is approximately 1,000 acres of residential land for sale in Franklin County, Illinois, based on recent Land Network data, making it the most common type of land for sale in Franklin County. The combined market value of farms, hunting land and other rural land and acreage for sale here is approximately $5 million. The average price of residential acreage for sale in Franklin County was $280,268. 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.