Frederick County is a county located in the northern part of the U.S. state of Maryland. 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. 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 been the home to several important historical figures like Francis Scott Key, Chris Rose, Zach Taylor, Matt Bennett, Thomas Johnson, Roger B. Taney, and Barbara Fritchie.
Frederick County straddles the boundary between the Piedmont Plateau Region and the Appalachian Mountains. The county’s two prominent ridges, Catoctin Mountain and South Mountain, form an extension of the Blue Ridge. The Middletown Valley lies between them. Attractions in the Frederick area include the Clustered Spires, a monument to Francis Scott Key, the National Museum of Civil War Medicine, Monocacy National Battlefield and South Mountain battlefields, and the Schifferstadt Architectural Museum.