There was a total of approximately $2 million of farms, rural land, hunting land and other land for sale in Illinois's Washington County recently on Land.com. The total size of all Washington County farms and rural real estate for sale was nearly 1,000 acres. Washington County ranks 81st out of 102 counties in the Land of Lincoln for the total acreage of land currently advertised for sale. Ashley featured the most land for sale. Washington County is Illinois's 46th biggest county (563 square miles). It's located in the Southern Illinois region of the state.