Washington County Fairgrounds March 16, 2023 Location 922 Front StreetMariettaOhio45750 Next Event America 250 4th of July Community Picnic - July 4, 2026 - 12:00 pm - 2:00 pm Upcoming Events America 250 4th of July Community Picnic - July 4, 2026 - 12:00 pm - 2:00 pmWashington County Fair - August 5, 2026 - August 8, 2026 - All Day