Of 44 counties in the Gem State, Washington County is 20th in terms of its size (1,473 square miles). Washington County is in Southwestern Idaho. A recent survey of Land Network data records about 2,000 acres of lakefront property for sale in Idaho's Washington County, which is valued at a combined $7 million. 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! The most common type of land for sale by combined acreage in Washington County is residential property.