Washington, D.C., officially the District of Columbia, is the city of the United States of America and is the seat of the U.S. government. It is located near Montgomery County, Maryland and Alexandria, Virginia.
The FBI having its headquarters in the city, agents Fox Mulder and Dana Scully resided and worked mostly from Washington D.C. and its metropolitan area until 2002 when they went into hiding and moved to Spotyslvania County, Virginia. The White House is located in this city. The Pentagon, where evidence concerning the X-Files is kept at a high security level, is located across the river from D.C.