Washington County Fairgrounds March 16, 2023 Location 922 Front StreetMariettaOhio45750 Next Event Washington County Fair - August 31, 2025 - September 3, 2025 - 9:00 am Upcoming Events Washington County Fair - August 31, 2025 - September 3, 2025 - 9:00 amWashington County Fair Fall Festival - October 11, 2025 - October 12, 2025 - 11:00 am - 7:00 pm