Clay County is in Southern Illinois. Of the 102 counties in the state, Clay County is 60th in terms of its size (300,501 acres). There is roughly 1,000 acres of residential land for sale in Illinois's Clay County based on recent Land Network data. The combined market value of farms and rural land for sale here is roughly $2 million. The average price of residential acreage for sale in Clay County was $216,763. 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.