Triangle: Demographics & People
Census counts 10,450 people in Triangle, in 3,312 households. Population shrank 7.2% from 11,265 (2022) to 10,450 (2024). Median age 35.6 years. (0.7y younger than Prince William County; 2.2y younger than Virginia). Children under 18 are 27% of the population. Population is 41% Black and 22% Hispanic or Latino. The community is highly diverse (Simpson index 0.70). 70% of households are family-led. County is losing 8,300 residents per year (2022-2023). County health: 33% adult obesity, 12% smoke.
- 3.2 people per household (vs Virginia avg 2.6).
- 30% non-family households (singles, roommates) (vs Virginia 35%).
- 52 dependents per 100 working-age (youth + seniors / 18-64) (vs Virginia 62).
Population & Trend
Population shrank 7.2% from 11,265 (2022) to 10,450 (2024). Estimated 2026 population: ~9,708 (extrapolated at -3.6%/yr trend). Census Bureau Vintage estimate: 8,771.
| Census data vintage | 2024 |
|---|---|
| Population | 482,204 people |
| Annual growth rate · Population change | -7.2% |
| Annual growth rate · Population (2022) | 11,265 |
| Annual growth rate · Population (2024) | 10,450 |
| Annual growth rate · Trend category | shrinking |
| Population | 10,450 people (vs Virginia 42,214) |
| Population Estimate | 8,771 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 35.6y is 3.3 years younger than the U.S. median (38.9y). Children under 18 make up 27% — above the U.S. share of ~22%.
| Age Summary · Median age | 35.6 years (vs Virginia 37.8y) |
|---|---|
| Age Summary · Children Pct | 26.6% |
| Age Summary · Character | family-oriented |
| Age Summary · Total Pop | 10,450 |
| Age Summary · Under 18 | 2,784 |
| Age Summary · 18 To 34 | 2,330.0× |
| Age Summary · 35 To 64 | 4,526.0× |
| Age Summary · 65 Plus | 810 |
| Population under 18 | 2,784 |
| Median age | 35.6 years (vs Virginia 37.8y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 10,450 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.70 (0 = single group, 1 = perfectly even distribution); this is read as highly diverse.
| White residents | 2,420 |
|---|---|
| Black residents | 4,799 |
| Asian residents | 1,624 |
| Hispanic or Latino residents | 2,335 |
| Diversity Index · Diversity index (Simpson) | 70.4% |
| Diversity Index · Diversity label | highly diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 42.9% |
| Asian population | 14.4% (vs Virginia 5.6%) |
| Black population | 40.7% (vs Virginia 18.2%) |
| Hispanic or Latino population | 22.1% (vs Virginia 10.1%) |
| White (non-Hispanic) population | 19.3% (vs Virginia 53.8%) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Ancestry
Self-reported ancestry from Census ACS — what residents report as their ethnic origin, separate from race. Counts can exceed population because people can list multiple ancestries.
Top (8)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 4.0% are foreign-born — below the U.S. average of 13.9%. 26% have naturalized to U.S. citizenship.
| Residents born in this state | 3,699 |
|---|---|
| Residents born in another state | 3,648 |
| Share born in this state | 35.4% |
| Share born in another state | 64.6% |
| Native-born U.S. citizens | 34.9% |
| Foreign-born residents | 4.0% |
| Naturalized citizens | 25.7% |
| Total foreign-born residents | 2,914 |
| From Europe | 7 |
| From Africa | 845 |
| From Latin America | 202 |
Households & Family Composition
3,312 households. Averaging 3.3 people each — larger than the U.S. average of 2.5. 70% are family households — above the U.S. share of ~65%. Of 2,487 families, 45% are married couples with children.
| Children under 18 | 2,901 |
|---|---|
| Total families | 2,487 |
| Married couples with children | 1,131 |
| Single-parent households | 69 |
| Average household size | 3.28 |
| Women who gave birth (past year) | 11.4% |
| Grandparents living with grandchildren | 90 |
| Family households | 2,333 households (vs Virginia 9,367) |
| Households that are families | 70.4% (vs Virginia 65.0%) |
| Total households | 3,312 households (vs Virginia 14,324) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 13.5% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 8,300 residents per year on net (IRS migration data).
| Moved within the county (past year) | 13.5% |
|---|---|
| Migration · People moving in (annual) | 493,472 |
| Migration · People moving out (annual) | 501,772 |
| Migration · Net migration (in − out) | -8,300 |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Disability
Census ACS measures self-reported functional limitations — vision, hearing, mobility, cognitive, self-care, or independent-living. The U.S. baseline disability rate is about 12–13%; rates trend higher with median age.
| Residents with a disability | 621 |
|---|---|
| Disability rate | 5.8% |
Group Quarters
Group quarters are non-household living arrangements counted by the Census — college dormitories, nursing homes, military barracks, group homes, correctional facilities, and similar institutional or shared housing. 15 residents live in group quarters (0.1% of population).
| Living in group quarters | 15 |
|---|
Other
| Congressional District · District | 11 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 51153 |
| Cdc Birth Rate · State Fips | 51 |
| Cdc Birth Rate · County Fips | 153 |
| Cdc Birth Rate · County | Prince William |
| Cdc Birth Rate · Birth Rate | 12.8% |
| Cdc Birth Rate · Lower Ci | 11.90 |
| Cdc Birth Rate · Upper Ci | 13.70 |
| Cdc Mortality · Fips | 51153 |
| Cdc Mortality · County | Prince William County |
| Cdc Mortality · Urban Rural | Large fringe metro |
| Cdc Mortality · Total Deaths 2020 2023 | 6,770 |
| Cdc Vaccination · Fips | 51153 |
| Cdc Vaccination · County | Prince William County |
| Cdc Vaccination · Dose1 Pop Pct | 91.8% |
| Cdc Vaccination · Series Complete Pct | 76.3% |
| Cdc Vaccination · Booster Pct | 46.6% |
| Cdc Vaccination · Population 2019 | 470,335 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 2.60 |
| Family Score · Schools | 2 |
| Family Score · Childcare Centers | 2 |
| Family Score · Children Pct | 26.6% |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 10,450, shrinking, family-oriented, affluent, white collar |
| Town Summary · Population | 10,450 people (vs Virginia 42,214) |
| Town Summary · County | Prince William County |
Sources: NCES school congressional district assignment · federal dataset cascade