Census tract · Fairfax County
Census Tract 4521.01, Fairfax County, Virginia
Census Tract 4521.01, GEOID 51059452101, in Fairfax County, Virginia, entirely within Annandale. 5,439 residents in the ACS 2020-2024 5-year estimates (±597); the 2020 Census counted 5,091.
Residents, 2020-2024
5,439
±597 (90% margin)
2020 Census count: 5,091
Median household income
$152,321
±$36,588 (90% margin)
Fairfax County: $153,637
Median home value
$755,400
±$67,317 (90% margin)
Fairfax County: $732,800
Median gross rent
$2,413
±$277 (90% margin)
Fairfax County: $2,276
Where is Census Tract 4521.01?
Census Tract 4521.01 is one of 274 census tracts in Fairfax County, Virginia. It covers 1.29 square miles of land, 3,934 residents per square mile in 2020. Its GEOID, 51059452101, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Annandale | 100% |
4 census tracts border Census Tract 4521.01: Tract 4519 ($104,655), Tract 4520 ($157,212), Tract 4521.02 ($123,611) and Tract 4525.01 ($163,214). The figure in brackets is each tract's median household income.
Whether a tract counts as low- or moderate-income for bank lending (the Community Reinvestment Act) is set by the FFIEC against its metro area's family income: look it up in the FFIEC census geocoder.
Source: 2024 Gazetteer and 2020 block assignment files, U.S. Census Bureau · Census reference files
How many people live in Census Tract 4521.01?
The 2020-2024 American Community Survey puts Census Tract 4521.01's population at 5,439 (±597) in 1,721 households; the 2020 Census counted 5,091 residents and 1,708 housing units.
| Measure | Tract 4521.01 | Annandale |
|---|---|---|
| Total population | 5,439 ±597 | 41,705 |
| Households | 1,721 ±205 | 13,891 |
| Average household size | 3.15 ±0.24 | 2.95 |
| Housing units | 1,761 ±206 | 14,474 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Census Tract 4521.01?
The median resident of Census Tract 4521.01 is 41.0 years old; 18.7% are under 18 and 19.3% are 65 or older. The largest group is non-Hispanic white residents at 34.7%, then non-Hispanic Asian residents at 25.5%. 36.8% of residents were born outside the United States.
| Measure | Tract 4521.01 | Annandale |
|---|---|---|
| Median age | 41.0 ±3.2 | 41.4 |
| Under 18 years | 18.7% ±3.0 pts | 22.1% |
| 65 years and over | 19.3% ±6.3 pts | 17.1% |
| Hispanic or Latino (any race) | 19.0% ±4.2 pts | 31.8% |
| White alone, not Hispanic | 34.7% ±7.4 pts | 31.2% |
| Black or African American alone, not Hispanic | 14.2% ±3.7 pts | 8.2% |
| Asian alone, not Hispanic | 25.5% ±4.9 pts | 23.6% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.7 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.7 pts | 0.0% |
| Two or more races, not Hispanic | 6.3% ±4.4 pts | 3.9% |
| Some other race alone, not Hispanic | 0.3% ±0.6 pts | 1.2% |
| Born outside the United States | 36.8% ±6.5 pts | 42.5% |
| Speak a language other than English at home (age 5+) | 42.1% ±8.9 pts | 55.2% |
| Civilian veterans (age 18+) | 3.4% ±1.4 pts | 5.0% |
| With a disability | 6.6% ±1.9 pts | 10.2% |
| No health insurance coverage | 6.5% ±3.7 pts | 15.2% |
| High school graduate or higher (age 25+) | 89.9% ±5.2 pts | 83.4% |
| Bachelor's degree or higher (age 25+) | 54.5% ±6.8 pts | 45.6% |
| Graduate or professional degree (age 25+) | 21.3% ±5.0 pts | 19.1% |
| Lived in the same house a year earlier | 90.5% ±5.1 pts | 86.8% |
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 Census Tract 4521.01 earn?
Half of the 1,721 households in Census Tract 4521.01 earn less than $152,321 a year (±$36,588), against $153,637 across Fairfax County: 144th highest of the county's 270 tracts with a reliable estimate.
| Measure | Tract 4521.01 | Annandale |
|---|---|---|
| Median household income | $152,321 ±$36,588 | $116,263 |
| Mean household income | $182,633 ±$17,436 | $157,958 |
| Per capita income | $59,618 ±$6,270 | $54,011 |
| People below the poverty line | 4.2% ±2.8 pts | 12.1% |
| Children under 18 below the poverty line | 7.0% ±11.1 pts | 17.9% |
| Households receiving SNAP | 2.8% ±2.2 pts | 10.6% |
| Households with a computer | 100.0% ±2.3 pts | 97.0% |
| Households with a broadband subscription | 97.8% ±1.6 pts | 93.5% |
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 Census Tract 4521.01?
Owners occupy 85.6% of Census Tract 4521.01's occupied homes and renters 14.4%. The median owner-occupied home is valued at $755,400 by its owner (±$67,317). The median renter pays $2,413 a month including utilities, and 38.2% of renters pay 35% or more of their income on rent.
| Measure | Tract 4521.01 | Annandale |
|---|---|---|
| Median home value (owner-occupied) | $755,400 ±$67,317 | $681,300 |
| Median gross rent | $2,413 ±$277 | $1,933 |
| Renters paying 35% or more of income on rent | 38.2% ±22.1 pts | 48.3% |
| Median monthly owner costs, with a mortgage | $3,277 ±$241 | $2,964 |
| Owner-occupied homes | 85.6% ±5.2 pts | 65.4% |
| Renter-occupied homes | 14.4% ±5.2 pts | 34.6% |
| Housing units | 1,761 ±206 | 14,474 |
| Single-family detached homes | 68.1% ±6.7 pts | 47.0% |
| Mobile homes | 0.0% ±2.2 pts | 0.4% |
| Built 2020 or later | 0.0% ±2.2 pts | 0.7% |
| Built 2010 to 2019 | 7.0% ±4.5 pts | 2.0% |
| Built 1939 or earlier | 1.2% ±1.6 pts | 0.7% |
| Households with no vehicle | 8.1% ±5.1 pts | 11.1% |
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 Census Tract 4521.01 get to work?
52.1% of Census Tract 4521.01's workers drive alone and 22.5% work from home. The average trip to work takes 26.8 minutes.
| Measure | Tract 4521.01 | Annandale |
|---|---|---|
| In the labor force (age 16+) | 72.0% ±4.5 pts | 68.6% |
| Unemployment rate | 4.0% ±2.9 pts | 4.9% |
| Drove alone to work | 52.1% ±9.3 pts | 56.7% |
| Carpooled | 11.6% ±5.7 pts | 14.8% |
| Public transportation | 6.4% ±4.8 pts | 4.8% |
| Walked | 5.2% ±6.0 pts | 2.2% |
| Worked from home | 22.5% ±5.1 pts | 19.7% |
| Mean travel time to work | 26.8 min ±3.8 | 27.3 min |
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
How does Census Tract 4521.01 compare with the other tracts in Fairfax County?
Among Fairfax County's tracts with a reliable estimate, Census Tract 4521.01 ranks as shown below (1 = highest).
| Measure | In Fairfax County | In Annandale |
|---|---|---|
| Population | 68th of 271 | 2nd of 10 |
| Residents per square mile | 170th of 274 | 7th of 10 |
| Median household income | 144th of 270 | 4th of 10 |
| Per capita income | 190th of 271 | 5th of 10 |
| Median home value | 110th of 263 | 3rd of 10 |
| Median gross rent | 136th of 248 | 3rd of 9 |
| Bachelor's degree or higher | 212th of 270 | 5th of 10 |
| Median age | 122nd of 271 | 8th of 10 |
| Owner-occupied share | 110th of 266 | 4th of 10 |
The tracts next to it on Fairfax County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 4617 | 141st | $154,987±$36,847 · within the margin of this tract |
| Tract 4823.03 | 142nd | $154,545±$23,489 · within the margin of this tract |
| Tract 4518 | 143rd | $154,083±$11,643 · within the margin of this tract |
| Tract 4521.01 | 144th | $152,321±$36,588 |
| Tract 4321 | 145th | $151,979±$18,154 · within the margin of this tract |
| Tract 4224.02 | 146th | $151,451±$39,273 · within the margin of this tract |
| Tract 4211.02 | 147th | $150,929±$32,292 · within the margin of this tract |
"Within the margin": the two incomes differ by less than their combined 90% margins, so the survey cannot say which is higher and the ranks between them are not firm.
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · How ranks are computed
How reliable are the figures for Census Tract 4521.01?
1 of the 18 figures for Census Tract 4521.01 on this page carries a coefficient of variation over 40% and is marked with a ring: they come from a small sample, so read them as rough.
A census tract's figures rest on a few hundred sampled households over five years, so its margins are wider than a city's. Two tracts differ only when the gap between them is larger than their combined 90% margin (the square root of the sum of the two squared margins). 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 · Check it at data.census.gov
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections