Douglas County is in Central Illinois. Of the 102 counties in the state, Douglas County ranks 72nd in terms of size (417 square miles). Illinois's Douglas County has almost 1,000 acres of residential land and property for sale based on recent Land Network data. The combined market value of farms and rural land for sale here was roughly $3 million. The average price of residential land for sale in Douglas County was $309,097. 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.