There was a combined almost $3 million of farms, rural land, hunting land and other land for sale in Illinois's Washington County recently on Land.com. The total acreage of all Washington County land and rural real estate for sale was 1,000 acres. Washington County ranks 85th in Illinois for the total number of acres of land currently advertised for sale. Among cities in Washington County with farms and rural land for sale, Okawville had the most land for sale. Washington County is the 46th largest county (563 square miles) in Illinois. It's located in the Southern Illinois region of Illinois.