The Washington County Fair is the largest and most established county fair in Arkansas. Founded in 1857, The Washington County Fair is a reflection of the past decades of farmers, business leaders, volunteers and youth that have, with hard work and dedication, made The Washington County Fair what it is today. Our future continues to grow each year, and it allows us to continue helping the youth of Washington County, while also promoting agriculture. $5 admittance for ages 6 and older.