State Route 605 (SR 605) in Fauquier and Prince William Counties, Virginia, United States is a 12.54 mi (20.18 km) secondary state highway from north of Warrenton near to southeast of Nokesville. From U.S. 15/U.S. 29 to its eastern terminus at VA 28, SR 605 serves as major artery serving traffic travelling between Warrenton and Nokesville, Manassas, and Dumfries. The entire route is two-lane and is located in rural or semi-rural areas, passing through farmland, woodland, and rural communities.