Adams County is in Western Illinois. Of the 102 counties in the Prairie State, 871-square-mile Adams County ranks 12th by size. There is around 1,000 acres of residential land for sale in Illinois's Adams County based on recent Land Network data, making it the most common type of land for sale in Adams County. The combined market value of land for sale here is approximately $13 million. The average price of residential acreage for sale in Adams County was $379,384. 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.