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
Route 903 (MTA Maryland) Route 903 (MTA Maryland) Route 903 is a commuter bus route operated by the Maryland Transit Administration in the U.S. state of Maryland and the District of Columbia between Charlotte Hall, Waldorf, Suitland, and downtown Washington, DC. The line is operated by Keller Transportation, Inc. under a service contract with MTA Maryland. Service operates on weekdays only, providing AM service from Charlotte Hall and Waldorf to Washington, and PM service from Washington to Waldorf and Charlotte Hall, operating primarily along Maryland Highway 5. The route has stops in the District of Columbia, two stops in Prince George's County (Suitland), and