Adams County is in Western Illinois. Of the 102 counties in the Inland Empire, Adams County is 12th in terms of its size (557,611 acres). There is around 1,000 acres of residential land for sale in Adams County, Illinois, based on recent Land Network data. The combined market value of land and rural real estate for sale here is approximately $12 million. The average price of residential land for sale in Adams County was $369,930. 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.