Census tract · San Mateo County
Census Tract 6021, San Mateo County, California
Census Tract 6021, GEOID 06081602100, in San Mateo County, California, entirely within South San Francisco. 3,262 residents in the ACS 2020-2024 5-year estimates (±520); the 2020 Census counted 3,710.
Residents, 2020-2024
3,262
±520 (90% margin)
2020 Census count: 3,710
Median household income
$82,679
±$24,438 (90% margin)
San Mateo County: $158,855
Median home value
$1,278,000
±$148,819 (90% margin)
San Mateo County: $1,559,600
Median gross rent
$2,475
±$290 (90% margin)
San Mateo County: $2,922
Where is Census Tract 6021?
Census Tract 6021 is one of 174 census tracts in San Mateo County, California. It covers 0.19 square miles of land, 20,054 residents per square mile in 2020. Its GEOID, 06081602100, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| South San Francisco | 100% |
5 census tracts border Census Tract 6021: Tract 6001 ($156,310), Tract 6020.01 ($176,389), Tract 6020.02 ($162,143), Tract 6022.02 ($92,191) and Tract 6023 ($146,750). 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 6021?
The 2020-2024 American Community Survey puts Census Tract 6021's population at 3,262 (±520) in 979 households; the 2020 Census counted 3,710 residents and 1,039 housing units.
| Measure | Tract 6021 | South San Francisco |
|---|---|---|
| Total population | 3,262±520 | 64,305 |
| Households | 979±125 | 21,838 |
| Average household size | 3.33±0.38 | 2.90 |
| Housing units | 1,053±108 | 23,515 |
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 6021?
The median resident of Census Tract 6021 is 40.8 years old; 18.2% are under 18 and 17.6% are 65 or older. The largest group is Hispanic or Latino residents (of any race) at 69.6%, then non-Hispanic Asian residents at 16.1%. 43.2% of residents were born outside the United States.
| Measure | Tract 6021 | South San Francisco |
|---|---|---|
| Median age | 40.8±4.4 | 43.2 |
| Under 18 years | 18.2%±7.2 pts | 17.2% |
| 65 years and over | 17.6%±4.9 pts | 19.2% |
| Hispanic or Latino (any race) | 69.6%±7.8 pts | 32.1% |
| White alone, not Hispanic | 8.6%±2.6 pts | 20.0% |
| Black or African American alone, not Hispanic | 4.0%±4.4 pts | 1.5% |
| Asian alone, not Hispanic | 16.1%±5.8 pts | 41.8% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.3 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.3 pts | 0.6% |
| Two or more races, not Hispanic | 0.5%±0.7 pts | 3.5% |
| Some other race alone, not Hispanic | 1.3%±1.3 pts | 0.3% |
| Born outside the United States | 43.2%±8.7 pts | 40.2% |
| Speak a language other than English at home (age 5+) | 74.5%±8.6 pts | 53.8% |
| Civilian veterans (age 18+) | 0.9%±1.2 pts | 2.5% |
| With a disability | 11.3%±4.3 pts | 10.8% |
| No health insurance coverage | 9.8%±6.1 pts | 3.1% |
| High school graduate or higher (age 25+) | 68.4%±8.2 pts | 86.0% |
| Bachelor's degree or higher (age 25+) | 18.7%±4.5 pts | 40.8% |
| Graduate or professional degree (age 25+) | 4.8%±2.8 pts | 12.6% |
| Lived in the same house a year earlier | 95.3%±2.8 pts | 92.1% |
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 6021 earn?
Half of the 979 households in Census Tract 6021 earn less than $82,679 a year (±$24,438), against $158,855 across San Mateo County: 167th highest of the county's 172 tracts with a reliable estimate. 14.2% of residents live below the poverty line.
| Measure | Tract 6021 | South San Francisco |
|---|---|---|
| Median household income | $82,679±$24,438 | $136,578 |
| Mean household income | $107,504±$18,440 | $177,602 |
| Per capita income | $34,445±$6,578 | $62,611 |
| People below the poverty line | 14.2%±8.4 pts | 6.7% |
| Children under 18 below the poverty line | 20.0%±18.3 pts | 7.5% |
| Households receiving SNAP | 12.6%±7.0 pts | 6.4% |
| Households with a computer | 93.8%±4.6 pts | 97.0% |
| Households with a broadband subscription | 93.5%±5.5 pts | 95.6% |
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 6021?
Owners occupy 31.4% of Census Tract 6021's occupied homes and renters 68.6%. The median owner-occupied home is valued at $1,278,000 by its owner (±$148,819). The median renter pays $2,475 a month including utilities, and 62.1% of renters pay 35% or more of their income on rent.
| Measure | Tract 6021 | South San Francisco |
|---|---|---|
| Median home value (owner-occupied) | $1,278,000±$148,819 | $1,188,800 |
| Median gross rent | $2,475±$290 | $2,802 |
| Renters paying 35% or more of income on rent | 62.1%±13.2 pts | 42.6% |
| Median monthly owner costs, with a mortgage | $3,987±$687 | $3,731 |
| Owner-occupied homes | 31.4%±9.3 pts | 59.0% |
| Renter-occupied homes | 68.6%±9.3 pts | 41.0% |
| Housing units | 1,053±108 | 23,515 |
| Single-family detached homes | 48.1%±9.5 pts | 58.5% |
| Mobile homes | 0.0%±4.0 pts | 1.2% |
| Built 2020 or later | 0.0%±4.0 pts | 2.1% |
| Built 2010 to 2019 | 1.2%±2.1 pts | 5.0% |
| Built 1939 or earlier | 21.7%±8.9 pts | 6.9% |
| Households with no vehicle | 5.8%±4.8 pts | 7.5% |
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 6021 get to work?
54.3% of Census Tract 6021's workers drive alone and 12.1% work from home. The average trip to work takes 27.1 minutes.
| Measure | Tract 6021 | South San Francisco |
|---|---|---|
| In the labor force (age 16+) | 68.6%±8.7 pts | 67.0% |
| Unemployment rate | 2.4%±1.9 pts | 2.8% |
| Drove alone to work | 54.3%±10.3 pts | 61.4% |
| Carpooled | 13.6%±5.6 pts | 11.4% |
| Public transportation | 10.6%±6.0 pts | 5.5% |
| Walked | 4.8%±3.9 pts | 1.9% |
| Worked from home | 12.1%±4.7 pts | 17.4% |
| Mean travel time to work | 27.1 min±4.3 | 25.6 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
How does Census Tract 6021 compare with the other tracts in San Mateo County?
Among San Mateo County's tracts with a reliable estimate, Census Tract 6021 ranks as shown below (1 = highest).
| Measure | In San Mateo County | In South San Francisco |
|---|---|---|
| Population | 127th of 172 | 13th of 14 |
| Residents per square mile | 14th of 173 | 3rd of 14 |
| Median household income | 167th of 172 | 14th of 14 |
| Per capita income | 167th of 172 | 14th of 14 |
| Median home value | 108th of 171 | 5th of 14 |
| Median gross rent | 136th of 169 | 10th of 14 |
| Poverty rate | 8th of 94 | 1st of 5 |
| Bachelor's degree or higher | 170th of 172 | 14th of 14 |
| Median age | 100th of 172 | 11th of 14 |
| Owner-occupied share | 151st of 171 | 12th of 14 |
The tracts next to it on San Mateo County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 6008 | 164th | $91,042±$21,948 · within the margin of this tract |
| Tract 6062.01 | 165th | $87,050±$25,812 · within the margin of this tract |
| Tract 6105 | 166th | $86,862±$28,095 · within the margin of this tract |
| Tract 6021 | 167th | $82,679±$24,438 |
| Tract 6013.01 | 168th | $82,232±$17,554 · within the margin of this tract |
| Tract 6102.03 | 169th | $77,604±$18,822 · within the margin of this tract |
| Tract 6120.02 | 170th | $76,047±$15,366 · 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 6021?
1 of the 18 figures for Census Tract 6021 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