Quantico is bordered by the U.S. military installation of 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. The word Quantico is a derivation of the name a Doeg village recorded by English colonists as Pamacocack.
Quantico is the site of one of the largest U.S. Marine Corps bases in the world, MCB Quantico. The base is the site of the Marine Corps Combat Development Command and HMX-1 (the presidential helicopter squadron). 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 (the original is at the north end of Arlington National Cemetery).
, the mayor is Kevin P. Brown.