|Named for||Francis Fauquier|
|• Total||651 sq mi (1,690 km2)|
|• Land||647 sq mi (1,680 km2)|
|• Water||3.8 sq mi (10 km2) 0.6%|
|• Density||110/sq mi (43/km2)|
|Time zone||UTC−5 (Eastern)|
|• Summer (DST)||UTC−4 (EDT)|
In 1608, the first European to explore in the vicinity, Captain John Smith, reported that the Whonkentia (a subgroup of the Siouan-speaking Manahoac tribe) inhabited the area. The Manahoac were forced out around 1670 by the Iroquois (Seneca), who did not resettle the area. The Conoy camped briefly near The Plains, from 1697 to 1699. The Six Nations ceded the entire region including modern Fauquier to Virginia Colony at the Treaty of Albany, in 1722.
Fauquier County was established on May 1, 1759, from Prince William County. It is named for Francis Fauquier, Lieutenant Governor of Virginia at the time, who won the land in a poker game, according to legend.
American Civil War battles in Fauquier County included (in order) the First Battle of Rappahannock Station, the Battle of Thoroughfare Gap, the Battle of Kelly's Ford, the Battle of Aldie, the Battle of Middleburg, the Battle of Upperville, the First and Second Battle of Auburn, the Battle of Buckland Mills, and the Second Battle of Rappahannock Station.
According to the U.S. Census Bureau, the county has an area of 651 square miles (1,690 km2), of which 647 square miles (1,680 km2) is land and 3.8 square miles (9.8 km2) (0.6%) is water. Fauquier county is not densely populated, but exurban development from Washington, DC has sprung up in some parts. Even in rural areas, housing complexes can be seen along highways. The highest point by elevation is Blue Mountain at 2,205 ft (672 meters) on the county's northwestern border with Warren County.
- Clarke County (north)
- Loudoun County (north)
- Prince William County (east)
- Stafford County (southeast)
- Culpeper County (southwest)
- Rappahannock County (west)
- Warren County (northwest)
|U.S. Decennial Census|
1990–2000 2010 2020
|Race / Ethnicity||Pop 2010||Pop 2020||% 2010||% 2020|
|White alone (NH)||53,410||54,969||81.91%||75.33%|
|Black or African American alone (NH)||5,232||4,999||8.02%||6.85%|
|Native American or Alaska Native alone (NH)||186||128||0.29%||0.18%|
|Asian alone (NH)||826||1,204||1.27%||1.65%|
|Pacific Islander alone (NH)||27||49||0.04%||0.07%|
|Some Other Race alone (NH)||103||339||0.16%||0.46%|
|Mixed Race/Multi-Racial (NH)||1,241||3,491||1.90%||4.78%|
|Hispanic or Latino (any race)||4,178||7,793||6.41%||10.68%|
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.
In 2000 there were 19,842 households, out of which 36.10% had children under the age of 18 living with them, 63.80% were married couples living together, 8.60% had a female householder with no husband present, and 23.70% were non-families. 18.70% of all households were made up of individuals, and 6.20% had someone living alone who was 65 years of age or older. The average household size was 2.75 and the average family size was 3.14.
As of 2013, the population was spread out, with 24.2% under the age of 18, 6.40% from 18 to 24, 30.30% from 25 to 44, 26.00% from 45 to 64, and 14.4% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 98.8 males. For every 100 females age 18 and over, there were 95.4 males.
The median income for a household in the county was $93,762. The per capita income for the county was $39,600. About 3.70% of families and 5.60% of the population were below the poverty line, including 4.70% of those under age 18 and 8.70% of those age 65 or over.
The county is exurban. There has been increased growth in Warrenton and New Baltimore in recent years. The subdivisions of Brookside and Vint Hill have facilitated the growth in the eastern part of the county. There is some industry in Fauquier County, however the largest employer in the county is the county government and the hospital. As of the 2000 census, 47% of county residents that work have jobs that are outside the county. The average travel time to work is 39.2 minutes.
Board of Supervisors
- Cedar Run District: Richard Gerhardt (R) – Chairman
- Center District: Kevin T. Carter (R)
- Lee District: Christopher Butler (R) - Vice Chairman
- Marshall District: Mary Leigh McDaniel (I)
- Scott District: R. Holder Trumbo Jr. (R) 
- Clerk of the Circuit Court: Gail H. Barb (R)
- Commissioner of the Revenue: Eric Maybach (R)
- Commonwealth's Attorney: Scott C. Hook (R)
- Sheriff: Jeremy A. Falls (R)
- Treasurer: Tanya Remson Wilcox (R)
The Virginia Senate:
- Jennifer Wexton (D)
The Fauquier County Sheriff's Office is the primary law enforcement agency in Fauquier County, Virginia. Its headquarters are in Warrenton. It supports the Warrenton Training Center, a CIA site in Warrenton.
Since 1952, Fauquier County has voted for the Republican Party in all but one presidential election.
- C. M. Bradley Elementary School
- James G. Brumfield Elementary School
- W. G. Coleman Elementary School
- Grace Miller Elementary School
- H. M. Pearson Elementary School
- C. Hunter Ritchie Elementary School
- P. B. Smith Elementary School
- Claude Thompson Elementary School
- Mary Walter Elementary School
- Greenville Elementary School
- M. M. Pierce Elementary School
- Auburn Middle School
- Cedar Lee Middle School
- W. C. Taylor Middle School
- Marshall Middle School
- Warrenton Middle School
- Fauquier High School
- Liberty High School
- Southeastern Alternative School
- Kettle Run High School
- Mountain Vista Governor's School
- Fresta Valley Christian School
- Highland School
- St. John The Evangelist Catholic School
- Wakefield School
- Laurel Ridge Community College
- Thorpe House Adult Learning Center
Other unincorporated communities
- James Markham Ambler, American naval surgeon
- Turner Ashby, born in Fauquier County, Confederate Army colonel in the American Civil War.
- Martin Berkofsky, classical pianist and philanthropist.
- Irv Cross, American footballer and sportscaster.
- Susan Cummings, an heiress infamous for killing Argentine polo player Roberto Villegas.
- Robert Duvall, American-born actor who maintains a farm in The Plains.
- Bertram and Diana Firestone, owners of Newstead Farm.
- George B. Fitch, American businessman, Mayor of Warrenton, founder of Jamaican Bobsled Team.
- Rear Admiral Cary Travers Grayson, owner of historic Blue Ridge Farm.
- Eppa Hunton, U.S. Representative and Senator from Virginia, born and lived in Warrenton.
- Charles Marshall, born in Warrenton, assistant adjutant general, aide de camp and military secretary to Gen. Robert E. Lee. Grandnephew of Chief Justice John Marshall.
- James K. Marshall, Colonel in the Confederate States Army, killed in action during Pickett's Charge at the Battle of Gettysburg while leading the brigade of J. Johnston Pettigrew, grandson of Chief Justice John Marshall.
- John Marshall, born in Fauquier County, Chief Justice of the United States.
- Paul Mellon, philanthropist, an Exemplar of Racing and owner of Rokeby Farm.
- John S. Mosby, lived in Warrenton, was a Confederate partisan ranger and cavalryman during the American Civil War. Buried in Warrenton cemetery.
- Karen O'Connor and David O'Connor, Olympic eventing riders
- Albert Rust, 19th-century American politician who served as a senior officer of the Confederate States Army during the American Civil War (1861–1865).
- Michaele Salahi and Tareq Salahi, the White House Gate Crashers.
- Willard Scott, an American media personality best known for his work on NBC's The Today Show who lived in Paris, Virginia.
- Scott Shipp, born in Warrenton, Superintendent of Virginia Military Institute from 1890 to 1907.
- Isabel Dodge Sloane, owner of Brookmeade Stud.
- William "Extra Billy" Smith, died in Warrenton, was a lawyer, congressman, two time Governor of Virginia and one of the oldest Confederate generals in the American Civil War.
- Shedrick Thompson, disputed lynching victim
- Liz Whitney Tippett, owner of the Llangollen estate.
- Fauquier County Sheriff's Office
- National Register of Historic Places listings in Fauquier County, Virginia
- Timeline of Fauquier County, Virginia in the Civil War
- Fauquier, British Columbia
- "State & County QuickFacts". United States Census Bureau. Retrieved January 2, 2014.
- "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
- Swanton, John R. (1952). The Indian Tribes of North America. Smithsonian Institution. pp. 61–62. hdl:2027/mdp.39015015025854. ISBN 0-8063-1730-2. OCLC 52230544.
- Harrison Williams, Legends of Loudoun, pp. 20-21.
- Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. pp. 124.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. February 1, 2011. Retrieved April 23, 2011.
- "Virginia County/Ind. City High Points". Peakbagger.com. Retrieved February 2, 2022.
- "Census of Population and Housing from 1790-2000". US Census Bureau. Retrieved January 24, 2022.
- "Historical Census Browser". University of Virginia Library. Archived from the original on August 11, 2012. Retrieved January 2, 2014.
- "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Archived from the original on December 15, 2013. Retrieved January 2, 2014.
- "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Archived (PDF) from the original on December 18, 2014. Retrieved January 2, 2014.
- "P2 HISPANIC OR LATINO, AND NOT HISPANIC OR LATINO BY RACE - 2010: DEC Redistricting Data (PL 94-171) - Fauquier County, Virginia". United States Census Bureau.
- "P2 HISPANIC OR LATINO, AND NOT HISPANIC OR LATINO BY RACE - 2020: DEC Redistricting Data (PL 94-171) - Fauquier County, Virginia". United States Census Bureau.
- "American FactFinder – Community Facts". factfinder.census.gov. U.S. Census Bureau. Archived from the original on February 11, 2020. Retrieved May 7, 2018.
- "Get A Life, Lose The Commute". Fauquier Times-Democrat. August 30, 2007. Archived from the original on January 22, 2013.
- "Board of Supervisors". Fauquier County. Retrieved October 3, 2022.
- "Constitutional Officers". Fauquier County. Archived from the original on December 30, 2017. Retrieved December 30, 2017.
- "Sheriff's Office | Fauquier County, VA". www.fauquiercounty.gov. Retrieved October 22, 2022.
- "Police Department | Warrenton, VA". www.warrentonva.gov. Retrieved January 5, 2023.
- "Welcome To Town Of Remington, VA". www.remington-va.gov. Retrieved January 5, 2023.
- Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Archived from the original on March 23, 2018. Retrieved May 7, 2018.
- "Home | Saint John the Evangelist School". www.sjesva.org. Retrieved December 14, 2021.
- Who Was Who in America, Historical Volume, 1607–1896. Chicago: Marquis Who's Who. 1963.