Quantico is a small town located in Prince William County, Virginia, United States. It is situated on the Potomac River and is known for being the home of the Quantico Marine Corps Base. The base is a major training facility for the United States Marine Corps and also houses other federal agencies, such as the FBI Academy. The town of Quantico has a population of around 480 people and is primarily made up of military personnel and their families. It is a quiet and close-knit community with a strong military presence.