Washington County Extension Office - Branch office of Ohio State University, it combines the needs of local citizens and communities, with new research and technical information. Marietta and Washington County Conventions and Visitors Bureau - Offers tourists river activities, festivals, and historic sites. Washington County - Official site provides information about the government, economic development, calendar, public safety, departments and social services. County Map - Ohio Department of Transportation map of Washington County. Washington County Board of Elections - Offers live and previous election results. Also provides the election calendar and information about the board, issues, candidates, voter registration and pollworker employment. Profile for Washington County - Information on the political infrastructure of the county.