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Frederick County, Maryland facts for kids

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Frederick County, Maryland
Frederick County
Downtown Frederick in June 2014
Downtown Frederick in June 2014
Flag of Frederick County, Maryland
Official seal of Frederick County, Maryland
Nickname(s): "Frederick", "FredCo"
Location in the U.S. state of Maryland
Location in the U.S. state of Maryland
Country  United States
State  Maryland
Founded June 10, 1748
 • Total 1,730 km2 (667 sq mi)
 • Land 1,700 km2 (660 sq mi)
 • Water 19 km2 (7.2 sq mi)
Population (2015)
 • Total 245,322
 • Density 142/km2 (368/sq mi)
Time zone Eastern (EST)
 • Summer (DST) EDT (UTC)
ZIP 21705, 21709, 21714, 21717, 21759, 21762, 21775, 21792
Area code(s) 240, 301
Congressional districts 6th, 8th

Frederick County is a county 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. The county is sometimes associated with Western Maryland, depending on the definition used. 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 been the home to several celebrated historical figures like Francis Scott Key, Chris Rose, Zach Taylor, Matt Bennett, Thomas Johnson, Roger B. Taney, and Barbara Fritchie.


The namesake of Frederick County and its county seat is unknown, but it probably was either Frederick, Prince of Wales or Frederick Calvert, 6th Baron Baltimore.


Frederick County was created in 1748 from parts of Prince George's County and Baltimore County.

In 1776, 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.


According to the U.S. Census Bureau, the county has a total area of 667 square miles (1,730 km2), of which 660 square miles (1,700 km2) is land and 7.2 square miles (19 km2) (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

National protected areas

  • Catoctin Mountain Park
  • Chesapeake and Ohio Canal National Historical Park (part)
  • Monocacy National Battlefield

Major highways

  • I-70 (MD).svg Interstate 70
  • I-270 (MD).svg Interstate 270
  • US 15.svg U.S. Route 15
  • US 40.svg U.S. Route 40
  • Alt plate.svg
    US 40.svg U.S. Route 40 Alternate
  • US 340.svg U.S. Route 340
  • MD Route 17.svg Maryland Route 17
  • MD Route 26.svg Maryland Route 26
  • MD Route 27.svg Maryland Route 27
  • MD Route 28.svg Maryland Route 28
  • MD Route 31.svg Maryland Route 31
  • MD Route 75.svg Maryland Route 75
  • MD Route 76.svg Maryland Route 76
  • MD Route 77.svg Maryland Route 77
  • MD Route 79.svg Maryland Route 79
  • MD Route 80.svg Maryland Route 80
  • MD Route 85.svg Maryland Route 85
  • MD Route 144.svg Maryland Route 144
  • MD Route 180.svg Maryland Route 180
  • MD Route 194.svg Maryland Route 194
  • MD Route 355.svg Maryland Route 355
  • MD Route 550.svg Maryland Route 550


Historical population
Census Pop.
1790 30,791
1800 31,523 2.4%
1810 34,437 9.2%
1820 40,459 17.5%
1830 45,789 13.2%
1840 36,405 −20.5%
1850 40,987 12.6%
1860 46,591 13.7%
1870 47,572 2.1%
1880 50,482 6.1%
1890 49,512 −1.9%
1900 51,920 4.9%
1910 52,673 1.5%
1920 52,541 −0.3%
1930 54,440 3.6%
1940 57,312 5.3%
1950 62,287 8.7%
1960 71,930 15.5%
1970 84,927 18.1%
1980 114,792 35.2%
1990 150,208 30.9%
2000 195,277 30.0%
2010 233,385 19.5%
Est. 2015 245,322 5.1%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2015

Frederick County has experienced a rapid increase in population in recent years, including that of minority groups.

2000 census

The summary statistics for Frederick County from the U.S. Census 2000 are provided to compare and contrast with the more current data from U.S. Census 2010. The following table includes the total persons, sex and self-designated ethnicity based on U.S. Census 2000; additional details are archived at the Maryland State Government website.


Male: 96,079 (49.2%) Female: 99,198 (50.8%)

ETHNICITY AS PERCENT TOTAL POPULATION: White: 176,965 (90.6%) Black or African American: 13,605 (7.0%) American Indian and Alaskan: 1,083 (0.6%) Asian: 4,066 (2.1%) Native Hawaiian and Other Pacific Islander: 156 (0.1%) Some other ethnicity: 2,434 (1.2%) The total (all races) of those self-identifying as Hispanic or Latino origin made up 2.4%, and those persons who were white alone made up 88.1%.

2010 census

As of 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 353.5 inhabitants per square mile (136.5/km2). There were 90,136 housing units at an average density of 136.5 per square mile (52.7/km2). The racial makeup 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. In terms of ancestry, 26.3% were German, 17.4% were Irish, 12.1% were English, 7.2% were Italian, and 6.3% were 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 income for a household in the county was $81,686 and the median income for a family was $95,036. Males had a median income of $62,494 versus $46,720 for females. The per capita income for the county 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.


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 (47.0% 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.


Fred ua
Map of urban areas in Frederick County
2008 03 28 - Frederick - City Hall 2
Frederick, the county seat and largest community in Frederick County.




Census-designated places

The Census Bureau recognizes the following census-designated places in the county:

Unincorporated communities

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