Washington County Fair is a 4-day fair set to be held on Aug 30 – Sep 2, 2025 at the Washington County Fairgrounds which is located in Marietta, Ohio and organized by Washington County Agricultural Society. The fair attracts over 30,000 visitors around the region. It features educational and agricultural events, various competitions and contests, and fun for the whole family. People of all ages will enjoy some good, clean entertainment, eat first-rate food prepared by local cooks, and view some great exhibits.