Washington County is in Pittsburgh & Countryside Pennsylvania. Of the 67 counties in the Independence State, 860-square-mile Washington County ranks 20th by size. Recent listings of undeveloped land for sale in Washington County, Pennsylvania, totals nearly 1,000 acres and a combined market value of almost $6 million. The most common type of land for sale by combined acreage in Washington County is residential property. The average price of undeveloped acreage for sale in Washington County was $280,876. Some suggested uses for undeveloped land currently for sale in Washington County include for hunting/fishing, commercial, and homestead use. Some common wildlife species to be found on undeveloped land for sale in Washington County include bear, whitetail deer, deer, turkey, blacktail deer and pheasant. Current commercial applications for commercial property for sale in Washington County include for hunting/fishing, commercial and homestead use. Browse all Pennsylvania undeveloped acreage for sale on the Land Network to find your next commercial property or land investment.