Triangle is a community in Prince William County, Virginia, home to about 10,450 people across 2.8 square miles. Its ZIP code is 22172.
Homes sold for a median of $218 per square foot in the three months ending August 2026, a balanced market.
Mostly Triangle; also Dumfries
Each card is that ZIP code’s whole market, including any part outside Triangle. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Triangle’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Ronald Reagan Washington National Airport (DCA)26 miles away |
|---|---|
| Nearest city of 250,000+ | Washington, DC29 miles away |
| Nearest city of 1 million+ | Philadelphia, PA154 miles away |
Straight-line distances from the center of Triangle; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Triangle had 9,589 residents in the 2020 census, up 74% since 2000.
It’s the 123rd largest of 669 towns in Virginia by population.
Prince William County grew from 11,112 residents in 1900 to 482,204 in 2020.
Prince William County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 28°F. About 40.9 inches of rain and melted snow fall in a typical year, with about 12 inches of snow.
Source: NOAA 1991–2020 climate normals, Quantico Mcas, VA weather station (4 miles away).
120,091 jobs at 9,286 businesses in Prince William County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
16 doctors and other health care providers list an office in Triangle.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Specialist doctors | 1 |
| Nurse practitioners and physician assistants | 5 |
| Mental health providers | 7 |
| Physical and occupational therapists | 2 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (8 nearby)
Grocery stores (1 nearby)
Pharmacies (1 nearby)
Libraries (1 nearby)
Museums (2 nearby)
Theaters and performance venues
Counts are within about 1.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Prince William County Public Schools. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Triangle ElementaryTriangle | Pre-K–5 | 795 | Public | 0.6 mi |
| Graham Park MiddleTriangle | 6–8 | 713 | Public | 0.3 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| St Francis of Assisi SchoolTriangle | Pre-K–8 | 250 | Roman Catholic | 0.5 mi |
| Star Bethlehem Christian AcademyTriangle | Pre-K–2 | 21 | Baptist | 0.9 mi |
| Calvary Christian SchoolTriangle | TK–11 | 90 | Christian (no specific denomination) | 0.9 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Dumfries.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.