Land for sale in Adams County recently totaled approximately $14 million and approximately 1,000 acres. Adams County ranks 79th out of 92 counties in the state for the total acreage of land currently advertised for sale. Of all locations in Adams County with farms, rural land, hunting land and other land for sale, Decatur featured the most land for sale. Adams County is the 73rd biggest county (339 square miles) in Indiana. It's located in the East Indiana region of Indiana.