Frederick is a city in west-central Maryland, United States. It is the county seat of Frederick County, the largest county by area in the state of Maryland. Frederick is an outlying community of the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area, which is part of a greater Washington-Baltimore-Northern Virginia, DC-MD-VA-WV Combined Statistical Area. As of the 2009 U.S. Census Bureau estimates, the city has a total population of 59,644, making it the third-largest incorporated area in Maryland, behind Baltimore and Rockville.








