Quantico is a town in Prince William County located in Washington Metropolitan Area. It is completely surrounded by Marine Corps Base Quantico on three sides and the Potomac River on the fourth. Quantico is located south of the mouth of Quantico Creek on the Potomac. Quantico is the site of one of the largest U.S. Marine Corps bases in the World. The base is the site of the Marine Corps Combat Development Command and HMX 1. The United States Drug Enforcement Administration's training academy, the FBI Academy, the FBI Laboratory, and the Naval Criminal Investigative Service headquarters are on the base. A replica of the USMC War Memorial stands in the entrance to the base.According to the United States Census Bureau, the town has a total area of 0.1 square miles (0.3 Square Kilometer), of which, 0.1 square miles (0.3 Square Kilometer) of it is land and none of the area is covered with water.