Home › Venues › Washington County Fair Complex Washington County Fair Complex Tickets Buy tickets for concerts at Washington County Fair Complex in Hillsboro, OR. No Upcoming Events No upcoming events scheduled at Washington County Fair Complex. Please contact us with any corrections. Hotels & Lodging Near Washington County Fair Complex About the Venue Washington County Fair Complex At-a-Glance Address873 NE 34th AveHillsboro, OR 97124United States Map & Directions Advertisement