Frederick County is located in Maryland, United States. 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.
Etymology
The namesake of Frederick County and its county seat is unknown, but it was probably either Frederick, Prince of Wales, or Frederick Calvert, 6th Baron Baltimore.
History
Frederick County was created in 1748 by the Province of Maryland from parts of Prince George's County and Baltimore County.
In 1776, following US independence, Frederick County was divided into three parts. The westernmost portion became Washington County, named after George Washington, the southernmost portion became Montgomery County, named after another Revolutionary War general, Richard Montgomery. The northern portion remained Frederick County.
In 1837, a part of Frederick County was combined with a part of Baltimore County to form Carroll County which is east of current day Frederick County.
The county has a number of properties on the National Register of Historic Places.
Geography
According to the U.S. Census Bureau, the county has a total area of , of which is land and (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.
Adjacent counties
Adams County, Pennsylvania (north) Carroll County (east) Franklin County, Pennsylvania (northwest) Montgomery County (south) Washington County (west) Loudoun County, Virginia (southwest)
National protected areas
Catoctin Mountain Park
Chesapeake and Ohio Canal National Historical Park (part) Monocacy National Battlefield
Major highways
Demographics
Frederick County has experienced a rapid increase in population in recent years, including that of minority groups.
2020 census
Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race.
2010 census
At the 2010 United States Census, there were 233,385 people, 84,800 households and 61,198 families residing in the county. The population density was . There were 90,136 housing units at an average density of . The racial make-up of the county was 81.5% white, 8.6% black or African American, 3.8% Asian, 0.3% American Indian, 2.9% from other races and 2.8% from two or more races. The total (all races) of those self-identifying as Hispanic or Latino origin made up 7.3%, and those persons who were white alone made up 77.8% of the population. 26.3% of the population cited German ancestry, 17.4% Irish, 12.1% English, 7.2% Italian, and 6.3% American.
Of the 84,800 households, 37.6% had children under the age of 18 living with them, 57.8% were married couples living together, 10.0% had a female householder with no husband present, 27.8% were non-families, and 22.0% of all households were made up of individuals. The average household size was 2.70 and the average family size was 3.17. The median age was 38.6 years.
The median household income was $81,686 and the median family income was $95,036. Males had a median income of $62,494 and females $46,720. The per capita income was $35,172. About 3.2% of families and 4.8% of the population were below the poverty line, including 5.8% of those under age 18 and 5.6% of those age 65 or over.<ref"></ref>
Law, government, and politics
Charter government
On December 1, 2014, Frederick County changed to a "charter home rule government".