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
Washington, Brandywine and Point Lookout Railroad Washington, Brandywine and Point Lookout Railroad The Washington, Brandywine & Point Lookout Railroad (WB&PL), now defunct, was an American railroad of southern Maryland and Washington, DC built in the 19th century. The troubled WB&PL, originally the Southern Maryland Railroad operated in and out of bankruptcy and changed its name numerous times. It consisted of two pieces, one serving Washington, D.C. and Seat Pleasant, MD and the other, a single track line connecting Patuxent River, MD to the Pennsylvania Railroad. Despite numerous problems, the railroad was able to survive for 73 years before shutting down in 1954. The Washington, DC section