There was a combined $200,000 of farmsand rural real estate for sale in Putnam County recently on Land.com. The total acreage of all Putnam County farms, hunting land and other rural land and acreage for sale was approximately 1,000 acres. Putnam County ranks 99th in Illinois for the combined amount of land currently advertised for sale. Of all locations in Putnam County with land and rural real estate for sale, Putnam had the most land for sale. Putnam County is Illinois's 102nd biggest county (172 square miles). It's located in the Western Illinois region of Illinois.