Fairfax: Demographics & People
Fairfax's population stands at 25,026 people, in 9,155 households. Population grew 2.2% from 24,478 (2022) to 25,026 (2024). Median age 36.6 years. (1.2y younger than Virginia). Children under 18 are 25% of the population. Population is 51% White (non-Hispanic) and 19% Hispanic or Latino. The community is highly diverse (Simpson index 0.61). 63% of households are family-led. County is gaining 557 residents per year (2022-2023). County health: 32% adult obesity, 12% smoke.
- 2.7 people per household (vs Virginia avg 2.6).
- 37% non-family households (singles, roommates) (vs Virginia 35%).
- 64 dependents per 100 working-age (youth + seniors / 18-64) (vs Virginia 62).
Population & Trend
Population grew 2.2% from 24,478 (2022) to 25,026 (2024) — about 3.7× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~25,589 (extrapolated at 1.1%/yr trend). Census Bureau Vintage estimate: 26,353.
| Census data vintage | 2024 |
|---|---|
| Population | 24,146 people |
| Annual growth rate · Population change | 2.2% |
| Annual growth rate · Population (2022) | 24,478 |
| Annual growth rate · Population (2024) | 25,026 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | growing |
| Population | 25,026 people (vs Virginia 42,214) |
| Population Estimate | 26,353 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 36.6y is 2.3 years younger than the U.S. median (38.9y). Children under 18 make up 25% — above the U.S. share of ~22%.
| Age Summary · Median age | 36.6 years (vs Virginia 37.8y) |
|---|---|
| Age Summary · Children Pct | 24.8% |
| Age Summary · Character | family-oriented |
| Age Summary · Total Pop | 25,026 |
| Age Summary · Under 18 | 6,210 |
| Age Summary · 18 To 34 | 5,729.0× |
| Age Summary · 35 To 64 | 9,569.0× |
| Age Summary · 65 Plus | 3,518 |
| Population under 18 | 6,210 |
| Median age | 36.6 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 25,026 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.61 (0 = single group, 1 = perfectly even distribution); this is read as highly diverse.
| White residents | 13,774 |
|---|---|
| Black residents | 1,565 |
| Asian residents | 4,419 |
| Hispanic or Latino residents | 4,483 |
| Diversity Index · Diversity index (Simpson) | 60.6% |
| Diversity Index · Diversity label | highly diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 56.8% |
| Asian population | 18.4% (vs Virginia 5.6%) |
| Black population | 6.3% (vs Virginia 18.2%) |
| Hispanic or Latino population | 18.9% (vs Virginia 10.1%) |
| White (non-Hispanic) population | 51.1% (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). 3.0% are foreign-born — below the U.S. average of 13.9%. 31% have naturalized to U.S. citizenship.
| Residents born in this state | 7,795 |
|---|---|
| Residents born in another state | 8,810 |
| Share born in this state | 31.1% |
| Share born in another state | 68.9% |
| Native-born U.S. citizens | 35.2% |
| Foreign-born residents | 3.0% |
| Naturalized citizens | 30.6% |
| Total foreign-born residents | 7,171 |
| From Europe | 521 |
| From Asia | 14 |
| From Africa | 3,185 |
| From Latin America | 52 |
Households & Family Composition
9,155 households. Averaging 2.6 people each — larger than the U.S. average of 2.5. 63% are family households — near the U.S. share of ~65%. Of 5,897 families, 36% are married couples with children.
| Children under 18 | 5,883 |
|---|---|
| Total families | 5,897 |
| Married couples with children | 2,141 |
| Single-parent households | 190 |
| Average household size | 2.61 |
| Women who gave birth (past year) | 10.4% |
| Grandparents living with grandchildren | 350 |
| Grandparents responsible for grandchildren | 167 |
| Family households | 5,775 households (vs Virginia 9,367) |
| Households that are families | 63.1% (vs Virginia 65.0%) |
| Total households | 9,155 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. 15.7% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 557 residents per year on net (IRS migration data).
| Moved within the county (past year) | 15.7% |
|---|---|
| Migration · People moving in (annual) | 27,559 |
| Migration · People moving out (annual) | 27,002 |
| Migration · Net migration (in − out) | 557 |
| Migration · Population growing | Yes |
| 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 | 861 |
|---|---|
| Disability rate | 3.6% |
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. 536 residents live in group quarters (2.1% of population).
| Living in group quarters | 536 |
|---|
Other
| Congressional District · District | 11 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 51600 |
| Cdc Birth Rate · State Fips | 51 |
| Cdc Birth Rate · County Fips | 600 |
| Cdc Birth Rate · County | Fairfax City |
| Cdc Birth Rate · Birth Rate | 9.0% |
| Cdc Birth Rate · Lower Ci | 6.30 |
| Cdc Birth Rate · Upper Ci | 12.50 |
| Cdc Mortality · Fips | 51600 |
| Cdc Mortality · County | Fairfax city |
| Cdc Mortality · Urban Rural | Large fringe metro |
| Cdc Mortality · Total Deaths 2020 2023 | 766 |
| Cdc Vaccination · Fips | 51600 |
| Cdc Vaccination · County | Fairfax city |
| Cdc Vaccination · Dose1 Pop Pct | 86.0% |
| Cdc Vaccination · Series Complete Pct | 69.8% |
| Cdc Vaccination · Booster Pct | 13.9% |
| Cdc Vaccination · Population 2019 | 24,019 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 10 |
| Family Score · Schools | 27 |
| Family Score · Childcare Centers | 48 |
| Family Score · Youth Sports Orgs | 2 |
| Family Score · Children Pct | 24.8% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 25,026, growing, family-oriented, affluent, white collar |
| Town Summary · Population | 25,026 people (vs Virginia 42,214) |
| Town Summary · County | Fairfax city |
Sources: NCES school congressional district assignment · federal dataset cascade