Frederick County is located in the northern part of the U.S. state of Maryland. As of the 2020 U.S. census, the population was 271,717. The county seat is Frederick.Frederick County is part of 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.
Catoctin Mountain Park in the county is the location of Camp David, a U.S. presidential retreat, and Fort Detrick, a U.S. Army base.
Wikipedia https://en.wikipedia.org/wiki/Frederick_County,_Maryland
Coordinates 39°24'56.804" N -77°24'45.923" E
