Frederick County, Maryland Frederick County, Maryland Frederick County is located in the northern part of the U.S. state of Maryland. As of the 2010 U.S. Census, the population was 240,336. The county seat is Frederick. Frederick County is included in the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area. Like other outlying sections of the Washington metropolitan area, Frederick County has experienced a rapid population increase in recent years. It borders the southern border of Pennsylvania and the northeastern border of Virginia. The county is home to Catoctin Mountain Park (encompassing the presidential retreat Camp David) and to the U.S. Army's Fort Detrick. It has also
Capital Plaza Mall hub---Landover Mall. Capital Plaza's prime location along Maryland Route 450 and the Baltimore-Washington Parkway made it ideal for shoppers by both automobile and public transit. Local bus service to Capital Plaza operated along Annapolis Road linking the plaza with shoppers from the nearby neighborhoods of College Park, Hyattsville, Riverdale, Rogers Heights, Edmonston, Bladensburg, Colmar Manor, Cottage City, Brentwood, Mount Rainier, Villa Heights, Cheverly, Landover Hills, Landover, New Carrollton, Lanham, Glenarden, and even certain pockets of Washington, DC (provided by the old WMA Transit Company, until later becoming the Metrobus system). In the late 1970s-1980s, Capital Plaza even featured a Trailways