Census tract · Contra Costa County
Census Tract 3540.01, Contra Costa County, California
Census Tract 3540.01, GEOID 06013354001, in Contra Costa County, California, mostly within Orinda (50% of its census blocks). 2,255 residents in the ACS 2020-2024 5-year estimates (±382); the 2020 Census counted 1,958.
Residents, 2020-2024
2,255
±382 (90% margin)
2020 Census count: 1,958
Median household income
$231,108
±$25,540 (90% margin)
Contra Costa County: $127,229
Median home value
$1,560,400
±$93,056 (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 3540.01?
Census Tract 3540.01 is one of 242 census tracts in Contra Costa County, California. It covers 5.29 square miles of land, 370 residents per square mile in 2020. Its GEOID, 06013354001, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Orinda | 50% |
5 census tracts border Census Tract 3540.01: Tract 4001 in Alameda County ($250,000 or more), Tract 4216 in Alameda County ($232,344), Tract 3530.01 ($250,000 or more), Tract 3540.02 ($250,000 or more) and Tract 3560.02 ($121,275). 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 3540.01?
The 2020-2024 American Community Survey puts Census Tract 3540.01's population at 2,255 (±382) in 819 households; the 2020 Census counted 1,958 residents and 751 housing units.
| Measure | Tract 3540.01 | Orinda |
|---|---|---|
| Total population | 2,255±382 | 19,514 |
| Households | 819±100 | 7,277 |
| Average household size | 2.75±0.25 | 2.67 |
| Housing units | 831±101 | 7,475 |
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 3540.01?
The median resident of Census Tract 3540.01 is 46.7 years old; 26.3% are under 18 and 20.8% are 65 or older. The largest group is non-Hispanic white residents at 68.6%, then non-Hispanic Asian residents at 16.1%. 18.4% of residents were born outside the United States.
| Measure | Tract 3540.01 | Orinda |
|---|---|---|
| Median age | 46.7±3.0 | 47.5 |
| Under 18 years | 26.3%±5.4 pts | 25.4% |
| 65 years and over | 20.8%±4.9 pts | 23.3% |
| Hispanic or Latino (any race) | 8.6%±4.3 pts | 6.5% |
| White alone, not Hispanic | 68.6%±10.2 pts | 66.8% |
| Black or African American alone, not Hispanic | 0.0%±1.9 pts | 0.4% |
| Asian alone, not Hispanic | 16.1%±9.5 pts | 16.0% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.9 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.9 pts | 0.0% |
| Two or more races, not Hispanic | 5.9%±3.1 pts | 9.8% |
| Some other race alone, not Hispanic | 0.7%±1.1 pts | 0.3% |
| Born outside the United States | 18.4%±6.1 pts | 18.6% |
| Speak a language other than English at home (age 5+) | 17.2%±7.1 pts | 19.9% |
| Civilian veterans (age 18+) | 5.9%±2.6 pts | 3.9% |
| With a disability | 8.0%±3.0 pts | 6.8% |
| No health insurance coverage | 0.0%±1.9 pts | 0.9% |
| High school graduate or higher (age 25+) | 98.3%±1.7 pts | 98.2% |
| Bachelor's degree or higher (age 25+) | 82.7%±4.0 pts | 85.9% |
| Graduate or professional degree (age 25+) | 47.6%±7.4 pts | 47.0% |
| Lived in the same house a year earlier | 91.1%±5.5 pts | 92.9% |
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 3540.01 earn?
Half of the 819 households in Census Tract 3540.01 earn less than $231,108 a year (±$25,540), against $127,229 across Contra Costa County: 24th highest of the county's 239 tracts with a reliable estimate.
| Measure | Tract 3540.01 | Orinda |
|---|---|---|
| Median household income | $231,108±$25,540 | $250,000 or more |
| Mean household income | $278,712±$31,124 | $376,741 |
| Per capita income | $100,762±$12,342 | $140,621 |
| People below the poverty line | 1.6%±1.3 pts | 2.2% |
| Children under 18 below the poverty line | 0.0%±6.9 pts | 0.4% |
| Households receiving SNAP | 0.9%±1.2 pts | 1.9% |
| Households with a computer | 98.4%±1.8 pts | 97.4% |
| Households with a broadband subscription | 95.8%±3.3 pts | 98.0% |
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 3540.01?
Owners occupy 86.9% of Census Tract 3540.01's occupied homes and renters 13.1%. The median owner-occupied home is valued at $1,560,400 by its owner (±$93,056). The median renter pays $3,500 or more a month including utilities, and 56.1% of renters pay 35% or more of their income on rent.
| Measure | Tract 3540.01 | Orinda |
|---|---|---|
| Median home value (owner-occupied) | $1,560,400±$93,056 | $1,863,200 |
| Median gross rent | $3,500 or more | $3,500 or more |
| Renters paying 35% or more of income on rent | 56.1%±24.7 pts | 35.8% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $4,000 or more |
| Owner-occupied homes | 86.9%±5.5 pts | 91.3% |
| Renter-occupied homes | 13.1%±5.5 pts | 8.7% |
| Housing units | 831±101 | 7,475 |
| Single-family detached homes | 98.4%±1.7 pts | 94.6% |
| Mobile homes | 0.0%±5.0 pts | 0.0% |
| Built 2020 or later | 0.0%±5.0 pts | 0.7% |
| Built 2010 to 2019 | 0.7%±1.3 pts | 3.7% |
| Built 1939 or earlier | 12.0%±5.4 pts | 5.0% |
| Households with no vehicle | 0.0%±5.1 pts | 4.2% |
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 3540.01 get to work?
51.6% of Census Tract 3540.01's workers drive alone and 29.6% work from home. The average trip to work takes 38.1 minutes. The unemployment rate in 2020-2024 averaged 3.4%.
| Measure | Tract 3540.01 | Orinda |
|---|---|---|
| In the labor force (age 16+) | 59.6%±5.4 pts | 60.7% |
| Unemployment rate | 3.4%±2.1 pts | 3.4% |
| Drove alone to work | 51.6%±8.8 pts | 43.3% |
| Carpooled | 5.0%±3.9 pts | 2.6% |
| Public transportation | 12.4%±7.9 pts | 12.2% |
| Walked | 1.4%±1.6 pts | 0.4% |
| Worked from home | 29.6%±6.9 pts | 39.3% |
| Mean travel time to work | 38.1 min±10.8 | 36.1 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 3540.01 compare with the other tracts in Contra Costa County?
Among Contra Costa County's tracts with a reliable estimate, Census Tract 3540.01 ranks as shown below (1 = highest).
| Measure | In Contra Costa County | In Orinda |
|---|---|---|
| Population | 230th of 241 | 4th of 4 |
| Residents per square mile | 232nd of 241 | 4th of 4 |
| Median household income | 24th of 239 | 4th of 4 |
| Per capita income | 29th of 241 | 4th of 4 |
| Median home value | 36th of 236 | 4th of 4 |
| Median gross rent | 1st of 236 | 1st of 4 |
| Bachelor's degree or higher | 10th of 239 | 4th of 4 |
| Median age | 44th of 241 | 3rd of 4 |
| Owner-occupied share | 52nd of 240 | 4th of 4 |
The tracts next to it on Contra Costa County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3551.22 | 21st | $246,979±$38,681 · within the margin of this tract |
| Tract 3451.16 | 22nd | $236,406±$24,068 · within the margin of this tract |
| Tract 3462.05 | 23rd | $233,333±$101,599 · within the margin of this tract |
| Tract 3540.01 | 24th | $231,108±$25,540 |
| Tract 3451.15 | 25th | $226,595±$28,402 · within the margin of this tract |
| Tract 3451.13 | 26th | $225,625±$39,227 · within the margin of this tract |
| Tract 3521.01 | 27th | $223,281±$60,205 · 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 3540.01?
2 of the 18 figures for Census Tract 3540.01 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