August 10, 2018 @ 12:00 pm - August 18, 2018 @ 10:00 pm Prince William County Fair (Northern Virginia) Prince William County Fair Grounds 10624 Dumfries Rd., Manassas, VA, United States The Prince William County Fair is the largest County Fair in the state of Virginia. The annual event in Manassas includes livestock exhibits, home arts exhibits, tractor pulls, a rodeo, demolition derbies, baby contests, live music and a variety of midway shows. Visitors can find an array of games and carnival rides, Prince William County 4-H […] $10.00 – $22.00