Warrenton is a town in Fauquier County, Virginia, United States. The population was 9,611 at the 2010 census, up from 6,670 at the 2000 census. The estimated population in 2015 was 9,897. Warrenton is the county seat of Fauquier County. It is at the junction of U.S. Route 15, U.S. Route 17, U.S. Route 29, and U.S. Route 211. The town is in the Piedmont region of Virginia, east of the Blue Ridge Mountains. The well-known Airlie Conference Center is 3 miles (5 km) north of Warrenton, and the historic Vint Hill Farms military facility is 9 miles (14 km) east. Fauquier Hospital is located in the town. Surrounded by Virginia wine and horse country, Warrenton is a popular destination outside of Washington, D.C.
Like many incorporated towns in Virginia, the town of Warrenton has government and taxation separate from the county. The town and the county do share some services, such as schools and the county landfill.