The Potomac and Rappahannock Transportation Commission (PRTC) is a multi-jurisdictional agency representing Prince William, Stafford and Spotsylvania Counties and the Cities of Manassas, Manassas Park and Fredericksburg. Located in Virginia about 25 miles southwest of Washington, D.C., PRTC provides local and commuter bus service to the residents of Prince William County and the Cities of Manassas and Manassas Park, VA.