Adams County is in Western Illinois. Of the 102 counties in the state, Adams County ranks 12th in terms of size (871 square miles). Recent listings of residential land and property for sale in Adams County, Illinois, totals approximately 1,000 acres and a combined market value of around $14 million. The most common type of land for sale by combined acreage in Adams County is house. The average price of residential acreage for sale in Adams County was $379,322. 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.