A combined almost 2,000 acres were listed for sale in Adams County, Illinois, recently; the value of all Adams County farms, rural land, hunting land and other land for sale was almost $33 million. Adams County ranks 32nd in the Prairie State for the total number of acres of land currently advertised for sale. Of all locations in Adams County with farms, rural land, hunting land and other land for sale, Quincy featured 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.