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
Maryland in the American Revolution first person to serve a full term as President of the Congress under the Articles of Confederation. From November 26, 1783, to June 3, 1784, Annapolis served as the United States capital and the Confederation Congress met in the Maryland State House. (Annapolis was a candidate to become the new nation's permanent capital before Washington, D.C. was built). It was in the old senate chamber that George Washington resigned his commission as commander in chief of the Continental Army on December 23, 1783. It was also there that the Treaty of Paris, which ended the Revolutionary War, was ratified by