The value of all land and rural real estate for sale in Washington County, Ohio, recently was around $34 million, representing a total of 2,151 acres of land for sale in Washington County. Washington County ranks 36th in the Buckeye State for the total acreage of land currently advertised for sale. There were seven properties listed as sold in Washington County through the Land Network Comparable Sales Program. This represented a total value of $1,077,403. Marietta had the most land for sale. Washington County is one of the ten largest counties in Ohio (639 square miles). It's located in the Southeast Ohio region of Ohio.