Washington County
Click here to view a map of Washington County
Click here for the Washington County Census Profile (2024)
Washington County is a county located in the southeastern part of the state of Ohio. As of the 2020 census, the population was 59,626. The county seat is Marietta, which is also the largest city in the county. Some of the places of interest in Washington County include the Campus Martius Museum, the Ohio River Museum, the Blennerhassett Island Historical State Park, and the Wayne National Forest. The largest employers in the county are Marietta Memorial Hospital, Washington County Board of Education, Thermo Fisher Scientific, and Solvay Specialty Polymers.