PlainCities

Census tract · Contra Costa County

Census Tract 3551.25, Contra Costa County, California

Census Tract 3551.25, GEOID 06013355125, in Contra Costa County, California, entirely within San Ramon. 3,980 residents in the ACS 2020-2024 5-year estimates (±484); the 2020 Census counted 4,261.

Residents, 2020-2024

3,980

±484 (90% margin)
2020 Census count: 4,261

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

$1,667,200

±$108,534 (90% margin)
Contra Costa County: $866,800

Median gross rent

$3,163

±$706 (90% margin)
Contra Costa County: $2,375

Where is Census Tract 3551.25?

Census Tract 3551.25 is one of 242 census tracts in Contra Costa County, California. It covers 0.44 square miles of land, 9,773 residents per square mile in 2020. Its GEOID, 06013355125, names it uniquely (how tract numbers and GEOIDs work).

Places Census Tract 3551.25 lies in (share of its 2020 census blocks)
PlaceShare of the tract
San Ramon100%
Census Tract 3551.25 (marked with a dot) in Contra Costa County, California. Boundaries: Census Bureau 2024.
3551.153551.213551.243551.26 3551.25 1 mi
Census Tract 3551.25 (shaded) and the tracts that border it, numbered. Boundaries: Census Bureau 2024 cartographic boundary file, 1:500,000.

4 census tracts border Census Tract 3551.25: Tract 3551.15 ($150,781), Tract 3551.21 ($250,000 or more), 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 3551.25?

The 2020-2024 American Community Survey puts Census Tract 3551.25's population at 3,980 (±484) in 1,162 households; the 2020 Census counted 4,261 residents and 1,229 housing units.

Counts, ACS 2020-2024 5-year estimates
MeasureTract 3551.25San RamonContra Costa CountyCalifornia
Total population3,980±48485,9931,165,01239,287,377
Households1,162±13830,103414,41713,548,091
Average household size3.43±0.242.852.782.84
Housing units1,206±12930,744429,26014,644,735

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 3551.25?

The median resident of Census Tract 3551.25 is 40.6 years old; 30.1% are under 18 and 4.8% are 65 or older. The largest group is non-Hispanic Asian residents at 72.9%, then non-Hispanic residents of two or more races at 9.5%. 47.8% 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 3551.25San RamonContra Costa CountyCalifornia
Median age40.6±2.641.640.537.9
Under 18 years30.1%±2.8 pts25.8%22.0%22.0%
65 years and over4.8%±2.8 pts12.2%17.1%15.7%
Hispanic or Latino (any race)5.9%±5.3 pts7.5%27.6%40.2%
White alone, not Hispanic7.6%±4.1 pts32.9%38.1%33.8%
Black or African American alone, not Hispanic3.6%±3.2 pts3.3%7.9%5.2%
Asian alone, not Hispanic72.9%±7.3 pts49.5%18.6%15.3%
American Indian and Alaska Native alone, not Hispanic0.0%±1.1 pts0.2%0.2%0.3%
Native Hawaiian and Other Pacific Islander alone, not Hispanic0.0%±1.1 pts0.2%0.5%0.3%
Two or more races, not Hispanic9.5%±5.2 pts5.8%6.3%4.4%
Some other race alone, not Hispanic0.4%±0.7 pts0.6%0.8%0.6%
Born outside the United States47.8%±5.4 pts38.6%26.6%27.0%
Speak a language other than English at home (age 5+)57.9%±6.9 pts46.8%37.5%44.4%
Civilian veterans (age 18+)2.3%±2.0 pts3.3%4.2%4.3%
With a disability2.2%±1.5 pts6.3%11.1%11.6%
No health insurance coverage0.9%±0.8 pts1.9%4.6%6.6%
High school graduate or higher (age 25+)96.8%±2.6 pts97.0%89.6%84.7%
Bachelor's degree or higher (age 25+)79.5%±8.1 pts71.6%45.2%37.1%
Graduate or professional degree (age 25+)37.4%±6.5 pts33.4%17.7%14.4%
Lived in the same house a year earlier90.6%±5.1 pts89.0%90.0%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 3551.25 earn?

Half of the 1,162 households in Census Tract 3551.25 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.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
MeasureTract 3551.25San RamonContra Costa CountyCalifornia
Median household income$250,000 or more$196,161$127,229$99,122
Mean household income$273,617±$32,569$239,072$174,872$140,436
Per capita income$80,810±$11,168$84,288$62,927$49,513
People below the poverty line2.2%±2.0 pts4.4%8.4%12.0%
Children under 18 below the poverty line1.9%±3.0 pts3.6%10.0%15.0%
Households receiving SNAP6.9%±5.5 pts2.9%8.5%12.4%
Households with a computer98.0%±2.4 pts98.8%97.7%96.9%
Households with a broadband subscription99.1%±1.7 pts97.1%95.6%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 3551.25?

Owners occupy 67.8% of Census Tract 3551.25's occupied homes and renters 32.2%. The median owner-occupied home is valued at $1,667,200 by its owner (±$108,534). The median renter pays $3,163 a month including utilities, and 54.3% of renters pay 35% or more of their income on rent.

Housing, ACS 2020-2024 5-year estimates
MeasureTract 3551.25San RamonContra Costa CountyCalifornia
Median home value (owner-occupied)$1,667,200±$108,534$1,509,500$866,800$734,700
Median gross rent$3,163±$706$2,968$2,375$2,036
Renters paying 35% or more of income on rent54.3%±20.6 pts39.3%47.4%46.0%
Median monthly owner costs, with a mortgage$4,000 or more$4,000 or more$3,435$2,946
Owner-occupied homes67.8%±9.6 pts70.9%68.0%55.9%
Renter-occupied homes32.2%±9.6 pts29.1%32.0%44.1%
Housing units1,206±12930,744429,26014,644,735
Single-family detached homes65.4%±8.0 pts63.5%67.5%57.0%
Mobile homes0.0%±3.5 pts0.0%1.4%3.5%
Built 2020 or later0.0%±3.5 pts0.8%1.1%1.3%
Built 2010 to 201918.6%±6.5 pts11.9%5.8%6.5%
Built 1939 or earlier0.7%±1.3 pts0.3%4.2%8.9%
Households with no vehicle1.7%±2.2 pts3.7%5.2%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 3551.25 get to work?

51.0% of Census Tract 3551.25's workers drive alone and 37.2% work from home. The average trip to work takes 45.0 minutes.

Work and commuting, ACS 2020-2024 5-year estimates
MeasureTract 3551.25San RamonContra Costa CountyCalifornia
In the labor force (age 16+)68.7%±7.0 pts69.3%64.7%63.8%
Unemployment rate1.1%±1.8 pts5.2%6.5%6.6%
Drove alone to work51.0%±9.1 pts54.7%59.7%65.7%
Carpooled3.2%±2.8 pts4.7%10.0%9.5%
Public transportation6.3%±5.3 pts3.4%5.4%2.9%
Walked1.3%±1.5 pts1.4%1.8%2.4%
Worked from home37.2%±10.3 pts33.9%21.3%17.2%
Mean travel time to work45.0 min±5.934.7 min35.3 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 3551.25 compare with the other tracts in Contra Costa County?

Among Contra Costa County's tracts with a reliable estimate, Census Tract 3551.25 ranks as shown below (1 = highest).

Census Tract 3551.25's rank among the tracts of Contra Costa County and of San Ramon
MeasureIn Contra Costa CountyIn San Ramon
Population161st of 24113th of 17
Residents per square mile26th of 2412nd of 17
Median household income1st of 2391st of 17
Per capita income61st of 24111th of 17
Median home value25th of 2365th of 17
Median gross rent58th of 23610th of 17
Bachelor's degree or higher19th of 2393rd of 17
Median age125th of 24114th of 17
Owner-occupied share147th of 24013th of 17

The tracts next to it on Contra Costa County's income ladder

Median household income, ACS 2020-2024 5-year estimates
TractRankMedian household incomeResidents
Tract 3452.041st$250,000 or more3,212
Tract 3461.011st$250,000 or more3,281
Tract 3461.021st$250,000 or more5,478
Tract 3462.041st$250,000 or more7,702
Tract 3462.061st$250,000 or more3,304
Tract 34701st$250,000 or more6,971
Tract 34801st$250,000 or more4,888
Tract 35121st$250,000 or more5,531
Tract 3521.021st$250,000 or more5,146
Tract 3530.011st$250,000 or more4,718
Tract 3530.021st$250,000 or more4,375
Tract 3540.021st$250,000 or more6,858
Tract 3551.131st$250,000 or more5,453
Tract 3551.211st$250,000 or more6,121
Tract 3551.231st$250,000 or more3,046
Tract 3551.241st$250,000 or more4,480
Tract 3551.251st$250,000 or more3,980
Tract 3551.261st$250,000 or more5,636
Tract 3553.021st$250,000 or more3,299
Tract 39201st$250,000 or more2,474

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 3551.25?

3 of the 18 figures for Census Tract 3551.25 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