Washington County is in Southern Illinois. Of the 102 counties in the Inland Empire, Washington County is 46th in terms of its size (360,901 acres). The most common type of land for sale by combined acreage in Washington County is residential property. Browse all waterfront property for sale in Washington County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits!