Johnson County is in Southern Illinois. Of the 102 counties in the Land of Lincoln, Johnson County ranks 84th in terms of size (223,272 acres). There is approximately 1,000 acres of residential land for sale in Johnson County, Illinois, based on recent Land Network data. The combined market value of land for sale here is almost $4 million. The average price of residential acreage for sale in Johnson County was $464,944. 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.