Land for sale in Adams County, Illinois, recently totaled around $28 million and approximately 1,000 acres. Adams County ranks 36th in the Inland Empire for the total number of acres of land currently advertised for sale. There were five properties listed as sold in Adams County through the Land Network Comparable Sales Program. This represented a total value of $4,398,000. Of all locations in Adams County with farms, rural land, hunting land and other land for sale, Quincy had the most land for sale. Adams County is the 12th largest county (871 square miles) in Illinois. It's located in the Western Illinois region of Illinois.