Census tract · San Mateo County
Census Tract 6018, San Mateo County, California
Census Tract 6018, GEOID 06081601800, in San Mateo County, California, mostly within South San Francisco (93% of its census blocks). 6,025 residents in the ACS 2020-2024 5-year estimates (±698); the 2020 Census counted 6,366.
Residents, 2020-2024
6,025
±698 (90% margin)
2020 Census count: 6,366
Median household income
$143,138
±$26,668 (90% margin)
San Mateo County: $158,855
Median home value
$1,325,600
±$83,337 (90% margin)
San Mateo County: $1,559,600
Median gross rent
$3,067
±$860 (90% margin)
San Mateo County: $2,922
Where is Census Tract 6018?
Census Tract 6018 is one of 174 census tracts in San Mateo County, California. It covers 0.71 square miles of land, 8,928 residents per square mile in 2020. Its GEOID, 06081601800, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| South San Francisco | 93% |
5 census tracts border Census Tract 6018: Tract 6016.03 ($108,476), Tract 6017 ($186,974), Tract 6019.02 ($125,096), Tract 6024 ($120,699) and Tract 6026.01 ($149,044). 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 6018?
The 2020-2024 American Community Survey puts Census Tract 6018's population at 6,025 (±698) in 2,188 households; the 2020 Census counted 6,366 residents and 2,085 housing units.
| Measure | Tract 6018 | South San Francisco |
|---|---|---|
| Total population | 6,025 ±698 | 64,305 |
| Households | 2,188 ±329 | 21,838 |
| Average household size | 2.69 ±0.24 | 2.90 |
| Housing units | 2,303 ±322 | 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 6018?
The median resident of Census Tract 6018 is 46.0 years old; 16.5% are under 18 and 18.8% are 65 or older. The largest group is non-Hispanic Asian residents at 41.8%, then Hispanic or Latino residents (of any race) at 25.5%. 35.2% of residents were born outside the United States.
| Measure | Tract 6018 | South San Francisco |
|---|---|---|
| Median age | 46.0 ±2.7 | 43.2 |
| Under 18 years | 16.5% ±3.1 pts | 17.2% |
| 65 years and over | 18.8% ±4.0 pts | 19.2% |
| Hispanic or Latino (any race) | 25.5% ±9.8 pts | 32.1% |
| White alone, not Hispanic | 25.4% ±6.4 pts | 20.0% |
| Black or African American alone, not Hispanic | 0.0% ±0.1 pts | 1.5% |
| Asian alone, not Hispanic | 41.8% ±7.3 pts | 41.8% |
| American Indian and Alaska Native alone, not Hispanic | 0.2% ±0.3 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 1.5% ±2.4 pts | 0.6% |
| Two or more races, not Hispanic | 5.6% ±3.5 pts | 3.5% |
| Some other race alone, not Hispanic | 0.0% ±0.7 pts | 0.3% |
| Born outside the United States | 35.2% ±5.5 pts | 40.2% |
| Speak a language other than English at home (age 5+) | 46.1% ±7.7 pts | 53.8% |
| Civilian veterans (age 18+) | 2.4% ±1.5 pts | 2.5% |
| With a disability | 9.0% ±2.9 pts | 10.8% |
| No health insurance coverage | 0.6% ±0.8 pts | 3.1% |
| High school graduate or higher (age 25+) | 89.6% ±4.7 pts | 86.0% |
| Bachelor's degree or higher (age 25+) | 43.4% ±7.8 pts | 40.8% |
| Graduate or professional degree (age 25+) | 14.7% ±4.8 pts | 12.6% |
| Lived in the same house a year earlier | 97.3% ±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 6018 earn?
Half of the 2,188 households in Census Tract 6018 earn less than $143,138 a year (±$26,668), against $158,855 across San Mateo County: 115th highest of the county's 172 tracts with a reliable estimate.
| Measure | Tract 6018 | South San Francisco |
|---|---|---|
| Median household income | $143,138 ±$26,668 | $136,578 |
| Mean household income | $191,461 ±$38,504 | $177,602 |
| Per capita income | $72,170 ±$12,380 | $62,611 |
| People below the poverty line | 4.9% ±3.8 pts | 6.7% |
| Children under 18 below the poverty line | 3.7% ±5.8 pts | 7.5% |
| Households receiving SNAP | 2.7% ±2.5 pts | 6.4% |
| Households with a computer | 96.3% ±5.3 pts | 97.0% |
| Households with a broadband subscription | 94.7% ±7.3 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 6018?
Owners occupy 87.6% of Census Tract 6018's occupied homes and renters 12.4%. The median owner-occupied home is valued at $1,325,600 by its owner (±$83,337). The median renter pays $3,067 a month including utilities.
| Measure | Tract 6018 | South San Francisco |
|---|---|---|
| Median home value (owner-occupied) | $1,325,600 ±$83,337 | $1,188,800 |
| Median gross rent | $3,067 ±$860 | $2,802 |
| Renters paying 35% or more of income on rent | 20.6% ±20.7 pts | 42.6% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $3,731 |
| Owner-occupied homes | 87.6% ±6.2 pts | 59.0% |
| Renter-occupied homes | 12.4% ±6.2 pts | 41.0% |
| Housing units | 2,303 ±322 | 23,515 |
| Single-family detached homes | 98.2% ±2.3 pts | 58.5% |
| Mobile homes | 0.0% ±1.8 pts | 1.2% |
| Built 2020 or later | 0.0% ±1.8 pts | 2.1% |
| Built 2010 to 2019 | 3.0% ±2.7 pts | 5.0% |
| Built 1939 or earlier | 2.0% ±2.2 pts | 6.9% |
| Households with no vehicle | 5.5% ±5.7 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 6018 get to work?
69.3% of Census Tract 6018's workers drive alone and 15.6% work from home. The average trip to work takes 25.5 minutes.
| Measure | Tract 6018 | South San Francisco |
|---|---|---|
| In the labor force (age 16+) | 68.1% ±5.6 pts | 67.0% |
| Unemployment rate | 2.0% ±1.9 pts | 2.8% |
| Drove alone to work | 69.3% ±9.0 pts | 61.4% |
| Carpooled | 4.0% ±3.2 pts | 11.4% |
| Public transportation | 7.9% ±7.5 pts | 5.5% |
| Walked | 2.1% ±2.3 pts | 1.9% |
| Worked from home | 15.6% ±7.1 pts | 17.4% |
| Mean travel time to work | 25.5 min ±3.0 | 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 6018 compare with the other tracts in San Mateo County?
Among San Mateo County's tracts with a reliable estimate, Census Tract 6018 ranks as shown below (1 = highest).
| Measure | In San Mateo County | In South San Francisco |
|---|---|---|
| Population | 24th of 172 | 2nd of 14 |
| Residents per square mile | 77th of 173 | 10th of 14 |
| Median household income | 115th of 172 | 8th of 14 |
| Per capita income | 100th of 172 | 3rd of 14 |
| Median home value | 99th of 171 | 2nd of 14 |
| Median gross rent | 88th of 169 | 6th of 14 |
| Bachelor's degree or higher | 124th of 172 | 7th of 14 |
| Median age | 26th of 172 | 4th of 14 |
| Owner-occupied share | 13th of 171 | 1st of 14 |
The tracts next to it on San Mateo County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 6002 | 112th | $144,000±$29,813 · within the margin of this tract |
| Tract 6085.02 | 113th | $143,826±$18,911 · within the margin of this tract |
| Tract 6029 | 114th | $143,287±$24,295 · within the margin of this tract |
| Tract 6018 | 115th | $143,138±$26,668 |
| Tract 6109.01 | 116th | $142,793±$59,294 · within the margin of this tract |
| Tract 6016.05 | 117th | $142,406±$29,043 · within the margin of this tract |
| Tract 6103.02 | 118th | $142,212±$25,912 · 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 6018?
2 of the 18 figures for Census Tract 6018 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.
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