Census tract · Contra Costa County
Census Tract 3551.23, Contra Costa County, California
Census Tract 3551.23, GEOID 06013355123, in Contra Costa County, California, mostly within San Ramon (85% of its census blocks). 3,046 residents in the ACS 2020-2024 5-year estimates (±543); the 2020 Census counted 2,957.
Residents, 2020-2024
3,046
±543 (90% margin)
2020 Census count: 2,957
Median household income
$250,000 or more
The survey's top or bottom value; no margin is published
Contra Costa County: $127,229
Median home value
$1,840,400
±$101,389 (90% margin)
Contra Costa County: $866,800
Median gross rent
$3,500 or more
The survey's top or bottom value; no margin is published
Contra Costa County: $2,375
Where is Census Tract 3551.23?
Census Tract 3551.23 is one of 242 census tracts in Contra Costa County, California. It covers 2.27 square miles of land, 1,304 residents per square mile in 2020. Its GEOID, 06013355123, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| San Ramon | 85% |
8 census tracts border Census Tract 3551.23: Tract 4501.02 in Alameda County ($239,250), Tract 4507.52 in Alameda County ($250,000 or more), Tract 3451.03 ($211,518), Tract 3451.12 ($216,774), Tract 3551.12 ($206,932), Tract 3551.15 ($150,781), Tract 3551.24 ($250,000 or more) and Tract 3551.26 ($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 3551.23?
The 2020-2024 American Community Survey puts Census Tract 3551.23's population at 3,046 (±543) in 907 households; the 2020 Census counted 2,957 residents and 758 housing units.
| Measure | Tract 3551.23 | San Ramon |
|---|---|---|
| Total population | 3,046±543 | 85,993 |
| Households | 907±183 | 30,103 |
| Average household size | 3.36±0.24 | 2.85 |
| Housing units | 958±197 | 30,744 |
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 3551.23?
The median resident of Census Tract 3551.23 is 42.9 years old; 25.6% are under 18 and 4.8% are 65 or older. The largest group is non-Hispanic Asian residents at 74.1%, then non-Hispanic residents of two or more races at 6.8%. 55.1% of residents were born outside the United States.
| Measure | Tract 3551.23 | San Ramon |
|---|---|---|
| Median age | 42.9±4.5 | 41.6 |
| Under 18 years | 25.6%±4.3 pts | 25.8% |
| 65 years and over | 4.8%±2.8 pts | 12.2% |
| Hispanic or Latino (any race) | 4.8%±3.4 pts | 7.5% |
| White alone, not Hispanic | 4.7%±4.2 pts | 32.9% |
| Black or African American alone, not Hispanic | 3.5%±3.9 pts | 3.3% |
| Asian alone, not Hispanic | 74.1%±11.9 pts | 49.5% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.4 pts | 0.2% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 6.1%±5.9 pts | 0.2% |
| Two or more races, not Hispanic | 6.8%±5.5 pts | 5.8% |
| Some other race alone, not Hispanic | 0.0%±1.4 pts | 0.6% |
| Born outside the United States | 55.1%±6.9 pts | 38.6% |
| Speak a language other than English at home (age 5+) | 70.8%±7.2 pts | 46.8% |
| Civilian veterans (age 18+) | 1.0%±1.0 pts | 3.3% |
| With a disability | 2.5%±1.9 pts | 6.3% |
| No health insurance coverage | 1.2%±1.4 pts | 1.9% |
| High school graduate or higher (age 25+) | 92.8%±8.8 pts | 97.0% |
| Bachelor's degree or higher (age 25+) | 73.6%±9.2 pts | 71.6% |
| Graduate or professional degree (age 25+) | 38.1%±9.0 pts | 33.4% |
| Lived in the same house a year earlier | 96.4%±3.2 pts | 89.0% |
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 3551.23 earn?
Half of the 907 households in Census Tract 3551.23 earn less than $250,000 or more a year (), against $127,229 across Contra Costa County: 1st highest of the county's 239 tracts with a reliable estimate.
| Measure | Tract 3551.23 | San Ramon |
|---|---|---|
| Median household income | $250,000 or more | $196,161 |
| Mean household income | $325,116±$58,999 | $239,072 |
| Per capita income | $96,517±$20,173 | $84,288 |
| People below the poverty line | 14.4%±11.3 pts | 4.4% |
| Children under 18 below the poverty line | 23.2%±20.3 pts | 3.6% |
| Households receiving SNAP | 0.0%±4.6 pts | 2.9% |
| Households with a computer | 100.0%±4.6 pts | 98.8% |
| Households with a broadband subscription | 100.0%±4.6 pts | 97.1% |
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 3551.23?
Owners occupy 97.1% of Census Tract 3551.23's occupied homes and renters 2.9%. The median owner-occupied home is valued at $1,840,400 by its owner (±$101,389). The median renter pays $3,500 or more a month including utilities.
| Measure | Tract 3551.23 | San Ramon |
|---|---|---|
| Median home value (owner-occupied) | $1,840,400±$101,389 | $1,509,500 |
| Median gross rent | $3,500 or more | $2,968 |
| Renters paying 35% or more of income on rent | 11.5%±24.7 pts | 39.3% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $4,000 or more |
| Owner-occupied homes | 97.1%±2.4 pts | 70.9% |
| Renter-occupied homes | 2.9%±2.4 pts | 29.1% |
| Housing units | 958±197 | 30,744 |
| Single-family detached homes | 82.3%±5.4 pts | 63.5% |
| Mobile homes | 0.0%±4.3 pts | 0.0% |
| Built 2020 or later | 0.0%±4.3 pts | 0.8% |
| Built 2010 to 2019 | 0.5%±0.9 pts | 11.9% |
| Built 1939 or earlier | 3.2%±5.2 pts | 0.3% |
| Households with no vehicle | 0.0%±4.6 pts | 3.7% |
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 3551.23 get to work?
40.6% of Census Tract 3551.23's workers drive alone and 50.0% work from home. The average trip to work takes 43.2 minutes.
| Measure | Tract 3551.23 | San Ramon |
|---|---|---|
| In the labor force (age 16+) | 67.5%±5.3 pts | 69.3% |
| Unemployment rate | 9.5%±6.4 pts | 5.2% |
| Drove alone to work | 40.6%±8.7 pts | 54.7% |
| Carpooled | 4.6%±2.6 pts | 4.7% |
| Public transportation | 2.9%±1.9 pts | 3.4% |
| Walked | 0.8%±0.9 pts | 1.4% |
| Worked from home | 50.0%±10.0 pts | 33.9% |
| Mean travel time to work | 43.2 min±5.3 | 34.7 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 3551.23 compare with the other tracts in Contra Costa County?
Among Contra Costa County's tracts with a reliable estimate, Census Tract 3551.23 ranks as shown below (1 = highest).
| Measure | In Contra Costa County | In San Ramon |
|---|---|---|
| Population | 206th of 241 | 16th of 17 |
| Residents per square mile | 200th of 241 | 15th of 17 |
| Median household income | 1st of 239 | 1st of 17 |
| Per capita income | 35th of 241 | 5th of 17 |
| Median home value | 18th of 236 | 3rd of 17 |
| Median gross rent | 1st of 236 | 1st of 17 |
| Bachelor's degree or higher | 37th of 239 | 7th of 17 |
| Median age | 87th of 241 | 8th of 17 |
| Owner-occupied share | 2nd of 240 | 1st of 17 |
The tracts next to it on Contra Costa County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3452.04 | 1st | $250,000 or more |
| Tract 3461.01 | 1st | $250,000 or more |
| Tract 3461.02 | 1st | $250,000 or more |
| Tract 3462.04 | 1st | $250,000 or more |
| Tract 3462.06 | 1st | $250,000 or more |
| Tract 3470 | 1st | $250,000 or more |
| Tract 3480 | 1st | $250,000 or more |
| Tract 3512 | 1st | $250,000 or more |
| Tract 3521.02 | 1st | $250,000 or more |
| Tract 3530.01 | 1st | $250,000 or more |
| Tract 3530.02 | 1st | $250,000 or more |
| Tract 3540.02 | 1st | $250,000 or more |
| Tract 3551.13 | 1st | $250,000 or more |
| Tract 3551.21 | 1st | $250,000 or more |
| Tract 3551.23 | 1st | $250,000 or more |
| Tract 3551.24 | 1st | $250,000 or more |
| Tract 3551.25 | 1st | $250,000 or more |
| Tract 3551.26 | 1st | $250,000 or more |
| Tract 3553.02 | 1st | $250,000 or more |
| Tract 3920 | 1st | $250,000 or more |
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 3551.23?
4 of the 18 figures for Census Tract 3551.23 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