Census-designated place · Virginia
South Run, Virginia
South Run, census-designated place, in Fairfax County, Virginia. South Run had 6,600 people in the ACS 2020-2024 5-year estimates (±1,149). GEOID 5174120.
Residents, 2020-2024
6,600
±1,149 (90% margin)
2020 Census count: 6,462
Median household income
$250,000 or more
The survey's top or bottom value; no margin is published
Virginia: $93,170
Median home value
$978,500
±$44,643 (90% margin)
Virginia: $383,700
Median gross rent
$3,500 or more
The survey's top or bottom value; no margin is published
Virginia: $1,579
Where is South Run and what county is it in?
South Run is a census-designated place: an unincorporated community the Census Bureau draws for counting, with no city government of its own, in Fairfax County, Virginia. It covers 2.5 square miles of land, 2,556 residents per square mile in 2020.
South Run 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 South Run, and is it growing?
The 2020-2024 American Community Survey puts South Run's population at 6,600 (±1,149). The 2020 Census counted 6,462 residents.
The Census Bureau publishes yearly population estimates for incorporated places only; South Run is a census-designated place, so its figures come from the ACS and the 2020 Census.
| Measure | South Run | Fairfax County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 6,600 ±1,149 | 1,147,837 | no clear change |
| Households | 1,916 ±259 | 414,101 | no clear change |
| Average household size | 3.44 ±0.35 | 2.75 | +0.54 |
| Housing units | 1,966 ±260 | 430,047 | 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 South Run?
The median resident of South Run is 39.4 years old; 31.5% are under 18 and 19.4% are 65 or older. The largest group is non-Hispanic white residents at 59.9%, then non-Hispanic Asian residents at 19.7%. 11.8% of residents were born outside the United States.
| Measure | South Run | Fairfax County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.4 ±10.3 | 39.1 | no clear change |
| Under 18 years | 31.5% ±5.8 pts | 22.9% | – |
| 65 years and over | 19.4% ±5.3 pts | 15.0% | – |
| Male | 54.5% ±4.9 pts | 49.9% | – |
| Hispanic or Latino (any race) | 7.9% ±3.2 pts | 17.6% | no clear change |
| White alone, not Hispanic | 59.9% ±8.9 pts | 46.8% | −14.8 pts |
| Black or African American alone, not Hispanic | 5.3% ±1.8 pts | 9.4% | no clear change |
| Asian alone, not Hispanic | 19.7% ±8.4 pts | 19.9% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.6 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.2% ±0.4 pts | 0.0% | – |
| Two or more races, not Hispanic | 6.3% ±3.0 pts | 5.4% | – |
| Some other race alone, not Hispanic | 0.6% ±0.8 pts | 0.8% | – |
| Born outside the United States | 11.8% ±4.0 pts | 30.8% | no clear change |
| Speak a language other than English at home (age 5+) | 15.2% ±4.5 pts | 39.0% | – |
| Civilian veterans (age 18+) | 19.0% ±4.9 pts | 7.5% | – |
| With a disability | 6.0% ±2.4 pts | 8.0% | – |
| No health insurance coverage | 0.2% ±0.3 pts | 7.1% | – |
| High school graduate or higher (age 25+) | 99.9% ±0.1 pts | 93.2% | – |
| Bachelor's degree or higher (age 25+) | 85.1% ±4.7 pts | 65.0% | no clear change |
| Graduate or professional degree (age 25+) | 52.6% ±7.4 pts | 33.0% | – |
| Lived in the same house a year earlier | 97.2% ±2.4 pts | 87.0% | – |
| Moved from another state in the past year | 0.3% ±0.5 pts | 3.2% | – |
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 South Run earn?
Half of South Run's 1,916 households earn less than $250,000 or more a year (), against $153,637 in Fairfax County and $93,170 in Virginia. In 2015-2019 it was $250,000 or more in 2024 dollars; the margins of error cannot tell the two periods apart.
| Measure | South Run | Fairfax County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $250,000 or more | $153,637 | no clear change |
| Mean household income | $298,175 ±$25,710 | $195,941 | – |
| Per capita income | $86,968 ±$10,371 | $71,828 | no clear change |
| People below the poverty line | 2.1% ±2.1 pts | 5.9% | – |
| Children under 18 below the poverty line | 0.9% ±1.5 pts | 7.2% | – |
| Households receiving SNAP | 0.0% ±2.1 pts | 4.3% | – |
| Households with a computer | 100.0% ±2.1 pts | 98.4% | – |
| Households with a broadband subscription | 100.0% ±2.1 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 South Run?
Owners occupy 96.1% of South Run's occupied homes and renters 3.9%. The median owner-occupied home is valued at $978,500 by its owner (±$44,643). The median renter pays $3,500 or more a month including utilities.
| Measure | South Run | Fairfax County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $978,500 ±$44,643 | $732,800 | no clear change |
| Median gross rent | $3,500 or more | $2,276 | −$808 |
| Renters paying 35% or more of income on rent | 0.0% ±38.0 pts | 36.3% | – |
| Median monthly owner costs, with a mortgage | $4,000 or more | $3,227 | – |
| Owner-occupied homes | 96.1% ±4.6 pts | 68.6% | no clear change |
| Renter-occupied homes | 3.9% ±4.6 pts | 31.4% | – |
| Housing units | 1,966 ±260 | 430,047 | no clear change |
| Homeowner vacancy rate | 0.0% ±2.1 pts | 0.4% | – |
| Rental vacancy rate | 0.0% ±38.0 pts | 4.4% | – |
| Single-family detached homes | 97.6% ±2.1 pts | 45.5% | – |
| Mobile homes | 0.0% ±2.0 pts | 0.5% | – |
| Built 2020 or later | 0.0% ±2.0 pts | 1.3% | – |
| Built 2010 to 2019 | 1.8% ±2.1 pts | 7.2% | – |
| Built 1939 or earlier | 0.0% ±2.0 pts | 1.1% | – |
| Households with no vehicle | 0.0% ±2.1 pts | 4.8% | – |
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 South Run work and get to work?
59.6% of South Run's workers drive alone and 33.0% work from home. The average trip to work takes 32.9 minutes.
| Measure | South Run | Fairfax County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 61.5% ±6.4 pts | 70.8% | – |
| Unemployment rate | 1.5% ±1.4 pts | 4.2% | – |
| Drove alone to work | 59.6% ±6.9 pts | 55.4% | – |
| Carpooled | 2.4% ±2.5 pts | 7.7% | – |
| Public transportation | 5.0% ±4.3 pts | 4.7% | – |
| Walked | 0.0% ±1.4 pts | 1.7% | – |
| Worked from home | 33.0% ±6.5 pts | 28.7% | +23.6 pts |
| Mean travel time to work | 32.9 min ±2.3 | 28.9 min | −4.6 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
What census tracts are in South Run?
1 census tract lies mostly in South Run, and 1 more reaches into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 4922.02Fairfax County | 6,797 | $250,000 or more |
| Tract 4921Fairfax County | 6,985 | $250,000 or more |
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 South Run) · Census block assignment files
How does South Run compare with other places in Virginia?
South Run ranks 1st 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) | 177th | 374 |
| Residents per square mile | 118th | 374 |
| Median household income | 1st | 365 |
| Per capita income | 21st | 374 |
| Median home value | 10th | 359 |
| Median gross rent | 1st | 341 |
| Bachelor's degree or higher | 5th | 359 |
| Median age | 184th | 372 |
| Owner-occupied share | 15th | 368 |
| Work from home | 38th | 286 |
| Travel time to work | 61st | 372 |
South Run's figures with every place in Virginia (CSV)
Every place in Virginia, sortable · Compare South Run 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 South Run?
21 of the 57 figures for South Run 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 South Run 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.