Census tract · San Mateo County
Census Tract 6121.01, San Mateo County, California
Census Tract 6121.01, GEOID 06081612101, in San Mateo County, California, mostly within East Palo Alto (63% of its census blocks). 3,949 residents in the ACS 2020-2024 5-year estimates (±814); the 2020 Census counted 4,174.
Residents, 2020-2024
3,949
±814 (90% margin)
2020 Census count: 4,174
Median household income
$123,472
±$36,036 (90% margin)
San Mateo County: $158,855
Median home value
$2,000,000 or more
The survey's top or bottom value; no margin is published
San Mateo County: $1,559,600
Median gross rent
$2,089
±$219 (90% margin)
San Mateo County: $2,922
Where is Census Tract 6121.01?
Census Tract 6121.01 is one of 174 census tracts in San Mateo County, California. It covers 0.26 square miles of land, 16,369 residents per square mile in 2020. Its GEOID, 06081612101, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| East Palo Alto | 63% |
| Menlo Park | 38% |
5 census tracts border Census Tract 6121.01: Tract 6120.01 ($130,741), Tract 6120.02 ($76,047), Tract 6121.02 ($71,769), Tract 6139 ($238,953) and Tract 5112 in Santa Clara County ($250,000 or more). 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 6121.01?
The 2020-2024 American Community Survey puts Census Tract 6121.01's population at 3,949 (±814) in 1,298 households; the 2020 Census counted 4,174 residents and 1,520 housing units.
| Measure | Tract 6121.01 | East Palo Alto |
|---|---|---|
| Total population | 3,949±814 | 29,069 |
| Households | 1,298±258 | 8,267 |
| Average household size | 3.02±0.38 | 3.49 |
| Housing units | 1,680±264 | 9,160 |
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 6121.01?
The median resident of Census Tract 6121.01 is 33.2 years old; 31.3% are under 18 and 16.1% are 65 or older. The largest group is Hispanic or Latino residents (of any race) at 46.0%, then non-Hispanic white residents at 30.5%. 32.9% of residents were born outside the United States.
| Measure | Tract 6121.01 | East Palo Alto |
|---|---|---|
| Median age | 33.2±7.2 | 36.3 |
| Under 18 years | 31.3%±6.7 pts | 20.4% |
| 65 years and over | 16.1%±7.2 pts | 10.3% |
| Hispanic or Latino (any race) | 46.0%±10.6 pts | 58.8% |
| White alone, not Hispanic | 30.5%±10.3 pts | 12.6% |
| Black or African American alone, not Hispanic | 1.3%±1.5 pts | 9.4% |
| Asian alone, not Hispanic | 8.4%±5.9 pts | 7.0% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.1 pts | 0.2% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 5.7%±7.5 pts | 7.8% |
| Two or more races, not Hispanic | 1.0%±1.0 pts | 2.5% |
| Some other race alone, not Hispanic | 7.0%±7.1 pts | 1.7% |
| Born outside the United States | 32.9%±7.9 pts | 44.1% |
| Speak a language other than English at home (age 5+) | 53.1%±10.6 pts | 65.9% |
| Civilian veterans (age 18+) | 3.2%±1.9 pts | 1.8% |
| With a disability | 6.6%±3.6 pts | 10.5% |
| No health insurance coverage | 4.7%±3.7 pts | 8.1% |
| High school graduate or higher (age 25+) | 81.2%±7.3 pts | 75.8% |
| Bachelor's degree or higher (age 25+) | 51.2%±12.0 pts | 26.8% |
| Graduate or professional degree (age 25+) | 26.8%±9.8 pts | 10.9% |
| Lived in the same house a year earlier | 83.0%±7.7 pts | 90.8% |
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 6121.01 earn?
Half of the 1,298 households in Census Tract 6121.01 earn less than $123,472 a year (±$36,036), against $158,855 across San Mateo County: 140th highest of the county's 172 tracts with a reliable estimate.
| Measure | Tract 6121.01 | East Palo Alto |
|---|---|---|
| Median household income | $123,472±$36,036 | $113,493 |
| Mean household income | $232,883±$46,745 | $144,799 |
| Per capita income | $77,747±$17,553 | $42,301 |
| People below the poverty line | 9.4%±7.5 pts | 10.3% |
| Children under 18 below the poverty line | 12.9%±15.7 pts | 8.9% |
| Households receiving SNAP | 18.3%±8.8 pts | 12.3% |
| Households with a computer | 100.0%±3.2 pts | 96.5% |
| Households with a broadband subscription | 92.9%±6.4 pts | 92.6% |
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 6121.01?
Owners occupy 36.1% of Census Tract 6121.01's occupied homes and renters 63.9%. The median owner-occupied home is valued at $2,000,000 or more by its owner (). The median renter pays $2,089 a month including utilities, and 32.0% of renters pay 35% or more of their income on rent.
| Measure | Tract 6121.01 | East Palo Alto |
|---|---|---|
| Median home value (owner-occupied) | $2,000,000 or more | $1,102,600 |
| Median gross rent | $2,089±$219 | $2,244 |
| Renters paying 35% or more of income on rent | 32.0%±11.9 pts | 49.9% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $3,875 |
| Owner-occupied homes | 36.1%±10.0 pts | 49.1% |
| Renter-occupied homes | 63.9%±10.0 pts | 50.9% |
| Housing units | 1,680±264 | 9,160 |
| Single-family detached homes | 39.4%±8.2 pts | 59.3% |
| Mobile homes | 0.0%±2.5 pts | 1.2% |
| Built 2020 or later | 0.7%±1.2 pts | 0.5% |
| Built 2010 to 2019 | 1.7%±1.7 pts | 4.7% |
| Built 1939 or earlier | 11.4%±8.7 pts | 4.1% |
| Households with no vehicle | 0.8%±1.3 pts | 6.1% |
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 6121.01 get to work?
53.9% of Census Tract 6121.01's workers drive alone and 17.4% work from home. The average trip to work takes 23.2 minutes.
| Measure | Tract 6121.01 | East Palo Alto |
|---|---|---|
| In the labor force (age 16+) | 68.0%±6.7 pts | 70.7% |
| Unemployment rate | 0.5%±0.8 pts | 5.1% |
| Drove alone to work | 53.9%±12.1 pts | 64.2% |
| Carpooled | 18.0%±9.4 pts | 12.3% |
| Public transportation | 0.0%±2.3 pts | 1.9% |
| Walked | 1.9%±3.4 pts | 1.7% |
| Worked from home | 17.4%±6.8 pts | 14.5% |
| Mean travel time to work | 23.2 min±4.7 | 23.7 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 6121.01 compare with the other tracts in San Mateo County?
Among San Mateo County's tracts with a reliable estimate, Census Tract 6121.01 ranks as shown below (1 = highest).
| Measure | In San Mateo County | In East Palo Alto |
|---|---|---|
| Population | 93rd of 172 | 4th of 7 |
| Residents per square mile | 26th of 173 | 2nd of 7 |
| Median household income | 140th of 172 | 4th of 7 |
| Per capita income | 89th of 172 | 1st of 7 |
| Median home value | 1st of 171 | 1st of 7 |
| Median gross rent | 157th of 169 | 5th of 7 |
| Bachelor's degree or higher | 94th of 172 | 1st of 7 |
| Median age | 160th of 172 | 6th of 7 |
| Owner-occupied share | 142nd of 171 | 6th of 7 |
The tracts next to it on San Mateo County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 6072 | 137th | $126,314±$18,607 · within the margin of this tract |
| Tract 6019.02 | 138th | $125,096±$24,119 · within the margin of this tract |
| Tract 6034 | 139th | $124,564±$38,309 · within the margin of this tract |
| Tract 6121.01 | 140th | $123,472±$36,036 |
| Tract 6016.01 | 141st | $122,672±$14,839 · within the margin of this tract |
| Tract 6119.01 | 142nd | $121,392±$31,738 · within the margin of this tract |
| Tract 6024 | 143rd | $120,699±$36,459 · 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 6121.01?
3 of the 18 figures for Census Tract 6121.01 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