# Triangle, Virginia > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Triangle,_Virginia > Markdown URL: https://mediated.wiki/source/Triangle,_Virginia.md > Source: https://en.wikipedia.org/wiki/Triangle%2C_Virginia > Source revision: 1336098376 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) **Triangle** is a [census-designated place](/source/Census-designated_place) (CDP) in southeastern [Prince William County, Virginia](/source/Prince_William_County,_Virginia), United States. The population was 9,589 at the 2020 census.[3] It is bounded to the south by the [Marine Corps Base Quantico](/source/Marine_Corps_Base_Quantico), which surrounds the town of [Quantico](/source/Quantico,_Virginia). Part of the [National Capital Region](/source/National_Capital_Region_(United_States)),[4] it is approximately 32 miles southwest of [Washington, D.C.](/source/Washington,_D.C.) ## Geography According to the [U.S. Census Bureau](/source/United_States_Census_Bureau), Triangle has a total area of 7.7 square miles (3.0 km2), of which 7.3 square miles (2.8 km2) is land and 0.5 square miles (0.2 km2) is water.[5] It is bounded to the north and west by [Dumfries](/source/Dumfries,_Virginia), to the west by [Prince William Forest Park](/source/Prince_William_Forest_Park), and to the east by the [Potomac River](/source/Potomac_River). The [National Museum of the Marine Corps](/source/National_Museum_of_the_Marine_Corps) is located here. ## Demographics As of the 2010 census,[1] there were 5,500 people, 2,196 households, and 1,341 families living in the CDP. The population density was 2,088.5 inhabitants per square mile (806.4 /km2). There were 2,318 housing units at an average density of 880.2 inhabitants per square mile (339.8 /km2). The racial makeup of the CDP was 61.07% [White](/source/White_(U.S._Census)), 28.33% [African American](/source/African_American_(U.S._Census)), 0.49% [Native American](/source/Native_American_(U.S._Census)), 2.87% [Asian](/source/Asian_(U.S._Census)), 0.11% [Pacific Islander](/source/Pacific_Islander_(U.S._Census)), 3.58% from [other races](/source/Race_(United_States_Census)), and 3.55% from two or more races. [Hispanic](/source/Hispanic_(U.S._Census)) or [Latino](/source/Latino_(U.S._Census)) of any race were 7.42% of the population. There were 2,196 households, out of which 33.9% had children under the age of 18 living with them, 40.4% were [married couples](/source/Marriage) living together, 15.3% had a female householder with no husband present, and 38.9% were non-families. 29.7% of all households were made up of individuals, and 3.6% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.13. In the CDP, the population was spread out, with 27.8% under the age of 18, 13.2% from 18 to 24, 34.4% from 25 to 44, 18.4% from 45 to 64, and 6.2% who were 65 years of age or older. The median age was 30 years. For every 100 females, there were 102.2 males. For every 100 females age 18 and over, there were 101.1 males. The median income for a household in the CDP was $38,844, and the median income for a family was $43,811. Males had a median income of $32,017 versus $27,722 for females. The [per capita income](/source/Per_capita_income) for the CDP was $18,982. About 7.1% of families and 8.8% of the population were below the [poverty line](/source/Poverty_line), including 11.4% of those under age 18 and 4.9% of those age 65 or over. In the [1950 United States census](/source/1950_United_States_census), Triangle was combined with [Dumfries, Virginia](/source/Dumfries,_Virginia) to form [Dumfries-Triangle](/source/Dumfries-Triangle,_Virginia). However, the two communities were separated again by the time of the 1960 census. ## Government Triangle is part of [Virginia's 31st House of Delegates district](/source/Virginia's_31st_House_of_Delegates_district); as of 10 January 2018, residents are represented by [Elizabeth Guzmán](/source/Elizabeth_Guzm%C3%A1n). ## References 1. ["U.S. Census website"](https://www.census.gov). [United States Census Bureau](/source/United_States_Census_Bureau). Retrieved 2008-01-31. 1. ["Triangle CDP, Virginia - Census Bureau Profile"](https://data.census.gov/profile/Triangle_CDP,_Virginia?g=160XX00US5179360). U.S. Census Bureau. Retrieved September 27, 2025. 1. ["National Capital Region Map"](https://www.ncpc.gov/maps/national-capital-region/). *www.ncpc.gov*. Retrieved 2025-08-18. 1. ["2020 U.S. Gazetteer Files"](https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2020_Gazetteer/2020_gaz_place_51.txt). United States Census Bureau. Retrieved October 30, 2021. ## External links - [Prince William County Government](http://www.pwcgov.org/) - [Dumfries Magisterial District Supervisor](http://www.dumfries.com/) - [The National Museum of the Marine Corps](http://www.usmcmuseum.org/) --- Adapted from the Wikipedia article [Triangle, Virginia](https://en.wikipedia.org/wiki/Triangle%2C_Virginia) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Triangle%2C_Virginia?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.