Census-designated place · Virginia
Triangle, Virginia
Triangle, census-designated place, in Prince William County, Virginia. Triangle had 10,450 people in the ACS 2020-2024 5-year estimates (±1,183). GEOID 5179360.
Residents, 2020-2024
10,450
±1,183 (90% margin)
2020 Census count: 9,589
Median household income
$109,693
±$15,421 (90% margin)
Virginia: $93,170
Median home value
$505,300
±$46,766 (90% margin)
Virginia: $383,700
Median gross rent
$1,554
±$119 (90% margin)
Virginia: $1,579
Where is Triangle and what county is it in?
Triangle is a census-designated place: an unincorporated community the Census Bureau draws for counting, with no city government of its own, in Prince William County, Virginia. It covers 2.8 square miles of land, 3,406 residents per square mile in 2020.
Triangle is in the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan statistical area, which takes in 23 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Triangle, and is it growing?
The 2020-2024 American Community Survey puts Triangle's population at 10,450 (±1,183). The 2020 Census counted 9,589 residents.
The Census Bureau publishes yearly population estimates for incorporated places only; Triangle is a census-designated place, so its figures come from the ACS and the 2020 Census.
| Measure | Triangle | Prince William County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 10,450 ±1,183 | 488,880 | +1,478 |
| Households | 3,312 ±291 | 156,798 | no clear change |
| Average household size | 3.15 ±0.24 | 3.09 | no clear change |
| Housing units | 3,444 ±304 | 161,852 | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Triangle?
The median resident of Triangle is 35.6 years old; 26.6% are under 18 and 7.8% are 65 or older. The largest group is non-Hispanic Black residents at 40.7%, then Hispanic or Latino residents (of any race) at 22.1%. 25.7% of residents were born outside the United States.
| Measure | Triangle | Prince William County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 35.6 ±1.9 | 36.3 | +3.0 |
| Under 18 years | 26.6% ±3.5 pts | 26.4% | – |
| 65 years and over | 7.8% ±2.1 pts | 11.3% | – |
| Male | 52.4% ±3.4 pts | 50.2% | – |
| Hispanic or Latino (any race) | 22.1% ±6.6 pts | 26.1% | no clear change |
| White alone, not Hispanic | 19.3% ±4.6 pts | 37.9% | −8.8 pts |
| Black or African American alone, not Hispanic | 40.7% ±6.6 pts | 19.6% | no clear change |
| Asian alone, not Hispanic | 14.4% ±7.9 pts | 9.9% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.4 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.4 pts | 0.1% | – |
| Two or more races, not Hispanic | 3.4% ±2.0 pts | 5.7% | – |
| Some other race alone, not Hispanic | 0.1% ±0.1 pts | 0.7% | – |
| Born outside the United States | 25.7% ±5.3 pts | 26.3% | no clear change |
| Speak a language other than English at home (age 5+) | 37.7% ±6.2 pts | 36.5% | – |
| Civilian veterans (age 18+) | 18.7% ±4.8 pts | 11.4% | – |
| With a disability | 10.3% ±2.9 pts | 8.9% | – |
| No health insurance coverage | 16.1% ±5.5 pts | 10.0% | no clear change |
| High school graduate or higher (age 25+) | 93.1% ±3.1 pts | 90.1% | – |
| Bachelor's degree or higher (age 25+) | 40.8% ±5.4 pts | 44.9% | no clear change |
| Graduate or professional degree (age 25+) | 15.6% ±3.5 pts | 18.1% | – |
| Lived in the same house a year earlier | 86.5% ±5.1 pts | 88.8% | – |
| Moved from another state in the past year | 1.8% ±1.3 pts | 1.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Triangle earn?
Half of Triangle's 3,312 households earn less than $109,693 a year (±$15,421), against $131,402 in Prince William County and $93,170 in Virginia. In 2015-2019 it was $103,733 in 2024 dollars; the margins of error cannot tell the two periods apart. 7.6% of residents live below the poverty line.
| Measure | Triangle | Prince William County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $109,693 ±$15,421 | $131,402 | no clear change |
| Mean household income | $134,548 ±$12,130 | $157,635 | – |
| Per capita income | $44,890 ±$4,652 | $51,802 | no clear change |
| People below the poverty line | 7.6% ±3.5 pts | 6.2% | −7.6 pts |
| Children under 18 below the poverty line | 4.1% ±3.3 pts | 7.8% | – |
| Households receiving SNAP | 6.2% ±3.3 pts | 5.8% | – |
| Households with a computer | 99.4% ±0.8 pts | 98.5% | – |
| Households with a broadband subscription | 96.3% ±2.6 pts | 96.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Triangle?
Owners occupy 63.1% of Triangle's occupied homes and renters 36.9%. The median owner-occupied home is valued at $505,300 by its owner (±$46,766). The median renter pays $1,554 a month including utilities, and 39.5% of renters pay 35% or more of their income on rent.
| Measure | Triangle | Prince William County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $505,300 ±$46,766 | $530,100 | −$51,220 |
| Median gross rent | $1,554 ±$119 | $2,067 | no clear change |
| Renters paying 35% or more of income on rent | 39.5% ±12.8 pts | 41.1% | no clear change |
| Median monthly owner costs, with a mortgage | $3,005 ±$270 | $2,714 | – |
| Owner-occupied homes | 63.1% ±6.6 pts | 74.3% | +14.3 pts |
| Renter-occupied homes | 36.9% ±6.6 pts | 25.7% | – |
| Housing units | 3,444 ±304 | 161,852 | no clear change |
| Homeowner vacancy rate | 0.0% ±1.9 pts | 0.4% | – |
| Rental vacancy rate | 7.1% ±5.9 pts | 3.9% | – |
| Single-family detached homes | 60.5% ±5.8 pts | 54.7% | – |
| Mobile homes | 1.1% ±1.9 pts | 0.9% | – |
| Built 2020 or later | 3.5% ±2.8 pts | 1.8% | – |
| Built 2010 to 2019 | 11.9% ±5.0 pts | 13.6% | – |
| Built 1939 or earlier | 6.2% ±3.3 pts | 1.2% | – |
| Households with no vehicle | 2.0% ±1.7 pts | 2.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Triangle work and get to work?
69.8% of Triangle's workers drive alone and 13.1% work from home. The average trip to work takes 38.7 minutes. The unemployment rate in 2020-2024 averaged 9.0%.
| Measure | Triangle | Prince William County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 68.3% ±5.4 pts | 71.7% | – |
| Unemployment rate | 9.0% ±4.4 pts | 4.8% | no clear change |
| Drove alone to work | 69.8% ±7.0 pts | 65.7% | – |
| Carpooled | 10.8% ±4.7 pts | 9.5% | – |
| Public transportation | 2.5% ±1.8 pts | 2.5% | – |
| Walked | 0.0% ±0.8 pts | 1.3% | – |
| Worked from home | 13.1% ±4.0 pts | 19.1% | +10.4 pts |
| Mean travel time to work | 38.7 min ±5.2 | 36.4 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Triangle?
1 census tract lies mostly in Triangle, and 2 more reach into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 9009.05Prince William County | 6,083 | $131,552 |
| Tract 9009.01Prince William County | 6,123 | $80,602 |
| Tract 9010.14Prince William County | 5,094 | $123,984 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Triangle) · Census block assignment files
How does Triangle compare with other places in Virginia?
Triangle ranks 131st of 365 places in Virginia with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population (ACS 2020-2024) | 123rd | 374 |
| Residents per square mile | 80th | 374 |
| Median household income | 131st | 365 |
| Per capita income | 160th | 374 |
| Median home value | 112th | 359 |
| Median gross rent | 160th | 341 |
| Poverty rate | 169th | 263 |
| Bachelor's degree or higher | 153rd | 359 |
| Median age | 291st | 372 |
| Owner-occupied share | 234th | 368 |
| Work from home | 190th | 286 |
| Travel time to work | 19th | 372 |
Triangle's figures with every place in Virginia (CSV)
Every place in Virginia, sortable · Compare Triangle with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Triangle?
12 of the 57 figures for Triangle on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Triangle are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.