Title: Frederick County, Maryland
Content:  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. Notable persons from here include Francis Scott Key, Chris Rose, Zach Taylor, Matt Bennett, Thomas Johnson, Roger B. Taney, and Barbara Fritchie.
Title: Frederick, Maryland
Content:  Frederick is a city in and the county seat of Frederick County, Maryland. It is part of the Baltimore–Washington Metropolitan Area. Frederick has long since been an important crossroads, located at the intersection of a major north–south Native American trail and east–west routes to the Chesapeake Bay, both at Baltimore and what became Washington, D.C. and across the Appalachian mountains to the Ohio River watershed. It is a part of the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area, which is part of a greater Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area. The city's population was 65,239 people as of the 2010 United States Census, making it the second-largest incorporated city in Maryland (behind Baltimore). Frederick is home to Frederick Municipal Airport (IATA: FDK), which accommodates general aviation, and Fort Detrick, a U.S. Army bioscience/communications research installation and Frederick county's largest employer.
Title: Frederick County, Maryland
Content:  According to the U.S. Census Bureau, the county has a total area of 667 sqmi, of which 660 sqmi is land and 7.2 sqmi (1.1%) is water. It is the largest county in Maryland in terms of land area. Frederick County straddles the boundary between the Piedmont Plateau Region and the Appalachian Mountains. The county's two prominent ridges, Catoctin Mountain and South Mountain, form an extension of the Blue Ridge. The Middletown Valley lies between them. Attractions in the Frederick area include the Clustered Spires, a monument to Francis Scott Key, the National Museum of Civil War Medicine, Monocacy National Battlefield and South Mountain battlefields, and the Schifferstadt Architectural Museum.
Title: Frederick, Maryland
Content:  Frederick is located in Frederick County in the northern part of the state of Maryland. The city has served as a major crossroads since colonial times. Today it is located at the junction of Interstate 70, Interstate 270, U.S. Route 340, U.S. Route 40, U.S. Route 40 Alternate and U.S. Route 15 (which runs north–south). In relation to nearby cities, Frederick lies 46 mi west of Baltimore, 49 mi north and slightly west of Washington, D.C., 24 mi southeast of Hagerstown and 71 mi southwest of Harrisburg, Pennsylvania. The city's coordinates are 39°25'35" North, 77°25'13" West (39.426294, −77.420403). According to the United States Census Bureau, the city has a total area of 23.96 sqmi, of which 23.79 sqmi is land and 0.18 sqmi is water. The city's area is predominantly land, with small areas of water being the Monocacy River, which runs to the east of the city, Carroll Creek (which runs through the city and causes periodic floods, such as that during the summer of 1972 and fall of 1976), as well as several neighborhood ponds and small city owned lakes, such as Culler Lake, a man-made small body of water in the downtown area.
Title: Frederick County, Maryland
Content: Brunswick ; Frederick (county seat) 
Title: Frederick County, Maryland
Content:  The Frederick County Sheriff's Office provides court protection, jail management, and morgue operation for the entire county. It provides police patrol and detective services within the unincorporated areas of Frederick County. The entire county entails a population of 222,938 residents within 662.88 square miles (1,717 km2). Frederick City, Brunswick, Mt.Airy, Emmitsburg, and Thurmont have municipal police departments. Middletown contracts with the Sheriff's Office for its policing.
Title: Frederick, Maryland
Content: Frederick Community College ; Hood College ; Mount St. Mary's University, Frederick County, Maryland 
Title: Fredericktown, Missouri
Content:  Fredericktown is a city in and the county seat of Madison County, Missouri, United States, in the northeastern foothills of the St. Francois Mountains. The population was 3,985 at the 2010 census. The city is surrounded on three sides (east, west, and south) by the easternmost parcel of the Mark Twain National Forest.
Title: Frederick County, Maryland
Content:  The United States Census Bureau estimates Frederick County's population at 245,322, marking a 5.1% increase since 2010. The racial makeup was estimated to be the following in 2014: 75% White (67.0% Non-Hispanic White), 9.7% Black, 4.6% Asian, 0.5% Native American, 0.1% Native Hawaiian or Pacific Islander, 2.8% Two or more races, and 8.7% were Hispanic or Latino, of any race.
Title: Frederick, Pennsylvania
Content:  Frederick is an unincorporated community in Upper Frederick Township in Montgomery County, Pennsylvania, United States. Frederick is located at the intersection of Pennsylvania Route 73 and Colonial Road.

Question: what county is frederick md in?
Answer: Frederick County.