22172

Triangle

Home of the National Museum of the Marine Corps and the edge of Prince William Forest Park.

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About Triangle

Triangle is a census-designated place in Prince William County with 9,589 people at the 2020 Census. It is bounded by Dumfries, Prince William Forest Park, the Potomac River and Marine Corps Base Quantico.

The base is right next door.

The National Museum of the Marine Corps in Triangle, Virginia
The National Museum of the Marine Corps. Photo: JLHJets, CC BY-SA 4.0, via Wikimedia Commons.

What people like most about Triangle

What Triangle offers

The National Museum of the Marine Corps is in Triangle, and Prince William Forest Park, Quantico Creek and the Medal of Honor Golf Course are close by. I-95 and Route 1 are nearby.

A little history

Triangle was combined with Dumfries in the 1950 Census as Dumfries-Triangle, and the two were separated again by the 1960 Census.

Triangle real estate at a glance

Figures for Triangle (census-designated place) and Prince William County. I did not fetch place-level housing statistics for Triangle, so county figures are shown for context.

Population (2020)
9,589
Triangle CDP, 2020 Census, per Wikipedia
Land area
7.3 sq. mi.
7.7 sq. mi. total
Prince William County population
502,966
2025 estimate; 482,204 in the 2020 Census
Prince William County homes
165,989
Housing units (156,798 households)
Prince William County median home value
$530,100
Owner-occupied homes, 2020–2024

Is new construction available?

Very limited. There are only a few new or recent listings in 22172, and nearby Potomac Shores and Southbridge in Dumfries have more new-construction options.

Sources are listed at the bottom of this page. Ask me for current prices and what is on the market right now.

Popular neighborhoods in Triangle

These are the Triangle neighborhoods buyers ask about most.

  • Cardinal Heights 1990s–2000s homes, four to six bedrooms, on larger yards.
  • Hickory Woods A neighborhood with an active HOA.
  • Old Triangle Road area

Around Triangle

Prince William Forest Park
Prince William Forest Park. Photo: National Park Service Digital Image Archives, public domain, via Wikimedia Commons.

Utilities and Services in Triangle

Here are the providers I could confirm for Triangle: water, sewer, power, gas, internet and trash. Where there is more than one option, I list them all. Which company serves a specific home can depend on the exact address, so confirm when you sign up. Links open in a new tab. Phone numbers and links were checked on October 27, 2026.

Trash & Recycling

What is your Triangle home worth?

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Sources and photo credits

  • U.S. Census Bureau QuickFacts, Prince William County, Virginia (2020 Census; July 1, 2025 population estimate; American Community Survey 2020–2024 five-year estimates), retrieved October 27, 2026.
  • Wikipedia, “Triangle, Virginia”.
  • Wikipedia, “Triangle, Virginia”.
  • Prince William Water and Prince William County Solid Waste Management pages.
  • Neighborhood information: Homes.com, Trulia and local real estate guides.
  • The National Museum of the Marine Corps. Photo: JLHJets, CC BY-SA 4.0, via Wikimedia Commons.
  • Prince William Forest Park. Photo: National Park Service Digital Image Archives, public domain, via Wikimedia Commons.
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