Alexander County is in Southern Illinois. Of the 102 counties in the Prairie State, Alexander County is 96th in terms of its size (252 square miles). There is about 1,000 acres of residential land for sale in Alexander County, Illinois, based on recent Land Network data. The combined market value of farms, hunting land and other rural land and acreage for sale here is around $700,000. The average price of residential acreage for sale in Alexander County was $160,375. 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.