PlainCities

Census tract · San Mateo County

Census Tract 6115, San Mateo County, California

Census Tract 6115, GEOID 06081611500, in San Mateo County, California, entirely within Atherton. 2,778 residents in the ACS 2020-2024 5-year estimates (±296); the 2020 Census counted 2,735.

Residents, 2020-2024

2,778

±296 (90% margin)
2020 Census count: 2,735

Median household income

$250,000 or more

The survey's top or bottom value; no margin is published
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

$3,500 or more

The survey's top or bottom value; no margin is published
San Mateo County: $2,922

Where is Census Tract 6115?

Census Tract 6115 is one of 174 census tracts in San Mateo County, California. It covers 1.62 square miles of land, 1,692 residents per square mile in 2020. Its GEOID, 06081611500, names it uniquely (how tract numbers and GEOIDs work).

Places Census Tract 6115 lies in (share of its 2020 census blocks)
PlaceShare of the tract
Atherton100%
Census Tract 6115 (marked with a dot) in San Mateo County, California. Boundaries: Census Bureau 2024.
6106.016106.026114611661256139 6115 1 mi
Census Tract 6115 (shaded) and the tracts that border it, numbered. Boundaries: Census Bureau 2024 cartographic boundary file, 1:500,000.

6 census tracts border Census Tract 6115: Tract 6106.01 ($98,167), Tract 6106.02 ($157,250), Tract 6114 ($250,000 or more), Tract 6116 ($250,000 or more), Tract 6125 ($165,521) and Tract 6139 ($238,953). 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 6115?

The 2020-2024 American Community Survey puts Census Tract 6115's population at 2,778 (±296) in 950 households; the 2020 Census counted 2,735 residents and 1,006 housing units.

Counts, ACS 2020-2024 5-year estimates
MeasureTract 6115AthertonSan Mateo CountyCalifornia
Total population2,778±2966,993742,34039,287,377
Households950±932,227264,41913,548,091
Average household size2.92±0.192.852.762.84
Housing units1,092±1472,667287,18414,644,735

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 6115?

The median resident of Census Tract 6115 is 49.6 years old; 20.1% are under 18 and 21.3% are 65 or older. The largest group is non-Hispanic white residents at 63.7%, then non-Hispanic Asian residents at 19.5%. 24.8% of residents were born outside the United States.

Age, origin, education, ACS 2020-2024 5-year estimates. Race groups are non-Hispanic; Hispanic includes any race.
MeasureTract 6115AthertonSan Mateo CountyCalifornia
Median age49.6±2.549.140.937.9
Under 18 years20.1%±2.2 pts18.4%19.5%22.0%
65 years and over21.3%±3.7 pts25.6%17.8%15.7%
Hispanic or Latino (any race)15.2%±8.4 pts14.2%24.9%40.2%
White alone, not Hispanic63.7%±8.1 pts62.0%34.7%33.8%
Black or African American alone, not Hispanic0.0%±1.5 pts0.9%2.0%5.2%
Asian alone, not Hispanic19.5%±5.4 pts18.0%31.0%15.3%
American Indian and Alaska Native alone, not Hispanic0.0%±1.5 pts0.0%0.1%0.3%
Native Hawaiian and Other Pacific Islander alone, not Hispanic0.0%±1.5 pts0.0%1.1%0.3%
Two or more races, not Hispanic1.6%±1.2 pts4.5%5.2%4.4%
Some other race alone, not Hispanic0.0%±1.5 pts0.4%0.9%0.6%
Born outside the United States24.8%±4.1 pts20.5%35.7%27.0%
Speak a language other than English at home (age 5+)28.7%±5.9 pts29.0%45.8%44.4%
Civilian veterans (age 18+)3.6%±1.6 pts3.4%2.9%4.3%
With a disability6.2%±2.3 pts8.6%9.4%11.6%
No health insurance coverage1.7%±1.4 pts1.7%3.8%6.6%
High school graduate or higher (age 25+)98.5%±1.3 pts98.6%90.2%84.7%
Bachelor's degree or higher (age 25+)85.6%±4.2 pts83.1%53.7%37.1%
Graduate or professional degree (age 25+)49.2%±6.3 pts52.3%24.1%14.4%
Lived in the same house a year earlier88.0%±4.4 pts85.3%88.4%89.2%

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 Census Tract 6115 earn?

Half of the 950 households in Census Tract 6115 earn less than $250,000 or more a year (), against $158,855 across San Mateo County: 1st highest of the county's 172 tracts with a reliable estimate.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
MeasureTract 6115AthertonSan Mateo CountyCalifornia
Median household income$250,000 or more$250,000 or more$158,855$99,122
Mean household income$604,311±$95,089$580,438$231,822$140,436
Per capita income$209,767±$25,658$188,631$84,288$49,513
People below the poverty line1.9%±1.3 pts5.3%6.7%12.0%
Children under 18 below the poverty line0.0%±7.3 pts8.1%6.2%15.0%
Households receiving SNAP0.0%±4.4 pts0.0%5.1%12.4%
Households with a computer99.5%±0.8 pts99.0%97.7%96.9%
Households with a broadband subscription96.1%±3.2 pts97.6%95.7%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 6115?

Owners occupy 92.2% of Census Tract 6115's occupied homes and renters 7.8%. The median owner-occupied home is valued at $2,000,000 or more by its owner (). The median renter pays $3,500 or more a month including utilities.

Housing, ACS 2020-2024 5-year estimates
MeasureTract 6115AthertonSan Mateo CountyCalifornia
Median home value (owner-occupied)$2,000,000 or more$2,000,000 or more$1,559,600$734,700
Median gross rent$3,500 or more$3,500 or more$2,922$2,036
Renters paying 35% or more of income on rent14.9%±17.5 pts18.0%40.3%46.0%
Median monthly owner costs, with a mortgage$4,000 or more$4,000 or more$4,000 or more$2,946
Owner-occupied homes92.2%±4.2 pts87.6%58.5%55.9%
Renter-occupied homes7.8%±4.2 pts12.4%41.5%44.1%
Housing units1,092±1472,667287,18414,644,735
Single-family detached homes99.5%±0.7 pts97.3%55.3%57.0%
Mobile homes0.0%±3.8 pts0.0%1.1%3.5%
Built 2020 or later1.9%±1.7 pts2.3%1.0%1.3%
Built 2010 to 20198.2%±4.3 pts12.3%5.4%6.5%
Built 1939 or earlier10.1%±5.8 pts17.2%8.6%8.9%
Households with no vehicle0.9%±1.1 pts1.7%5.8%7.1%

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 6115 get to work?

47.3% of Census Tract 6115's workers drive alone and 46.6% work from home. The average trip to work takes 25.0 minutes.

Work and commuting, ACS 2020-2024 5-year estimates
MeasureTract 6115AthertonSan Mateo CountyCalifornia
In the labor force (age 16+)49.4%±5.5 pts48.2%67.3%63.8%
Unemployment rate2.3%±1.9 pts3.2%4.8%6.6%
Drove alone to work47.3%±7.7 pts44.9%56.7%65.7%
Carpooled3.4%±3.3 pts7.0%8.7%9.5%
Public transportation0.5%±0.8 pts1.7%5.1%2.9%
Walked0.2%±0.4 pts3.8%2.3%2.4%
Worked from home46.6%±8.5 pts40.8%24.3%17.2%
Mean travel time to work25.0 min±2.123.2 min26.4 min28.7 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 6115 compare with the other tracts in San Mateo County?

Among San Mateo County's tracts with a reliable estimate, Census Tract 6115 ranks as shown below (1 = highest).

Census Tract 6115's rank among the tracts of San Mateo County
MeasureIn San Mateo County
Population153rd of 172
Residents per square mile155th of 173
Median household income1st of 172
Per capita income1st of 172
Median home value1st of 171
Median gross rent1st of 169
Bachelor's degree or higher6th of 172
Median age9th of 172
Owner-occupied share3rd of 171

The tracts next to it on San Mateo County's income ladder

Median household income, ACS 2020-2024 5-year estimates
TractRankMedian household incomeResidents
Tract 60561st$250,000 or more6,204
Tract 60571st$250,000 or more4,929
Tract 60691st$250,000 or more2,496
Tract 60711st$250,000 or more2,726
Tract 6080.231st$250,000 or more2,348
Tract 60881st$250,000 or more6,046
Tract 60931st$250,000 or more3,428
Tract 60941st$250,000 or more3,251
Tract 60951st$250,000 or more4,686
Tract 6096.011st$250,000 or more3,460
Tract 6096.021st$250,000 or more1,719
Tract 60971st$250,000 or more4,608
Tract 60981st$250,000 or more4,491
Tract 60991st$250,000 or more2,955
Tract 61141st$250,000 or more4,215
Tract 61151st$250,000 or more2,778
Tract 61161st$250,000 or more2,431
Tract 61271st$250,000 or more2,078
Tract 61281st$250,000 or more3,126
Tract 61291st$250,000 or more4,517
Tract 61301st$250,000 or more3,245
Tract 61321st$250,000 or more6,481
Tract 61331st$250,000 or more2,801
Tract 61341st$250,000 or more3,077

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 6115?

2 of the 18 figures for Census Tract 6115 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