Census tract · Contra Costa County
Census Tract 3511.05, Contra Costa County, California
Census Tract 3511.05, GEOID 06013351105, in Contra Costa County, California, entirely within Walnut Creek. 1,721 residents in the ACS 2020-2024 5-year estimates (±357); the 2020 Census counted 1,723.
Residents, 2020-2024
1,721
±357 (90% margin)
2020 Census count: 1,723
Median household income
$69,375
±$24,656 (90% margin)
Contra Costa County: $127,229
Median home value
$481,700
±$21,221 (90% margin)
Contra Costa County: $866,800
Median gross rent
$1,865
±$1,025 (90% margin)
Contra Costa County: $2,375
Where is Census Tract 3511.05?
Census Tract 3511.05 is one of 242 census tracts in Contra Costa County, California. It covers 0.31 square miles of land, 5,487 residents per square mile in 2020. Its GEOID, 06013351105, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Walnut Creek | 100% |
4 census tracts border Census Tract 3511.05: Tract 3342 ($189,153), Tract 3410 ($157,959), Tract 3511.03 ($97,417) and Tract 3511.04 ($66,500). 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 3511.05?
The 2020-2024 American Community Survey puts Census Tract 3511.05's population at 1,721 (±357) in 1,221 households; the 2020 Census counted 1,723 residents and 1,457 housing units.
| Measure | Tract 3511.05 | Walnut Creek |
|---|---|---|
| Total population | 1,721±357 | 70,088 |
| Households | 1,221±181 | 33,072 |
| Average household size | 1.35±0.12 | 2.09 |
| Housing units | 1,345±162 | 34,389 |
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 3511.05?
The median resident of Census Tract 3511.05 is 79.0 years old. The largest group is non-Hispanic white residents at 81.6%, then non-Hispanic Asian residents at 10.3%. 23.9% of residents were born outside the United States.
| Measure | Tract 3511.05 | Walnut Creek |
|---|---|---|
| Median age | 79.0±3.0 | 46.8 |
| Under 18 years | 0.0%±2.4 pts | 15.5% |
| 65 years and over | 87.6%±5.0 pts | 29.5% |
| Hispanic or Latino (any race) | 2.2%±2.0 pts | 12.4% |
| White alone, not Hispanic | 81.6%±7.2 pts | 61.3% |
| Black or African American alone, not Hispanic | 1.6%±2.0 pts | 1.8% |
| Asian alone, not Hispanic | 10.3%±5.5 pts | 17.1% |
| American Indian and Alaska Native alone, not Hispanic | 0.4%±1.2 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±2.4 pts | 0.1% |
| Two or more races, not Hispanic | 3.3%±3.3 pts | 6.5% |
| Some other race alone, not Hispanic | 0.6%±1.0 pts | 0.8% |
| Born outside the United States | 23.9%±8.2 pts | 24.4% |
| Speak a language other than English at home (age 5+) | 22.1%±9.1 pts | 27.8% |
| Civilian veterans (age 18+) | 14.4%±7.6 pts | 5.6% |
| With a disability | 38.1%±13.3 pts | 12.8% |
| No health insurance coverage | 0.9%±1.4 pts | 2.3% |
| High school graduate or higher (age 25+) | 98.3%±2.0 pts | 97.2% |
| Bachelor's degree or higher (age 25+) | 68.0%±8.4 pts | 70.4% |
| Graduate or professional degree (age 25+) | 32.2%±9.9 pts | 30.6% |
| Lived in the same house a year earlier | 87.0%±6.2 pts | 84.6% |
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 3511.05 earn?
Half of the 1,221 households in Census Tract 3511.05 earn less than $69,375 a year (±$24,656), against $127,229 across Contra Costa County: 224th highest of the county's 239 tracts with a reliable estimate.
| Measure | Tract 3511.05 | Walnut Creek |
|---|---|---|
| Median household income | $69,375±$24,656 | $130,432 |
| Mean household income | $81,727±$10,395 | $179,868 |
| Per capita income | $58,696±$9,204 | $85,521 |
| People below the poverty line | 4.1%±3.2 pts | 6.4% |
| Households receiving SNAP | 3.7%±3.8 pts | 3.0% |
| Households with a computer | 99.3%±1.1 pts | 98.3% |
| Households with a broadband subscription | 90.8%±5.4 pts | 96.3% |
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 3511.05?
Owners occupy 89.6% of Census Tract 3511.05's occupied homes and renters 10.4%. The median owner-occupied home is valued at $481,700 by its owner (±$21,221). The median renter pays $1,865 a month including utilities.
| Measure | Tract 3511.05 | Walnut Creek |
|---|---|---|
| Median home value (owner-occupied) | $481,700±$21,221 | $1,057,300 |
| Median gross rent | $1,865±$1,025 | $2,680 |
| Renters paying 35% or more of income on rent | 57.6%±44.3 pts | 42.1% |
| Median monthly owner costs, with a mortgage | $2,688±$219 | $3,764 |
| Owner-occupied homes | 89.6%±6.6 pts | 64.4% |
| Renter-occupied homes | 10.4%±6.6 pts | 35.6% |
| Housing units | 1,345±162 | 34,389 |
| Single-family detached homes | 2.8%±2.4 pts | 36.8% |
| Mobile homes | 0.0%±3.1 pts | 0.2% |
| Built 2020 or later | 0.0%±3.1 pts | 0.7% |
| Built 2010 to 2019 | 0.0%±3.1 pts | 5.5% |
| Built 1939 or earlier | 1.0%±1.7 pts | 2.2% |
| Households with no vehicle | 16.5%±6.4 pts | 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 3511.05 get to work?
66.5% of Census Tract 3511.05's workers drive alone and 33.5% work from home. The average trip to work takes 26.9 minutes.
| Measure | Tract 3511.05 | Walnut Creek |
|---|---|---|
| In the labor force (age 16+) | 16.0%±6.6 pts | 59.2% |
| Unemployment rate | 0.0%±14.3 pts | 6.0% |
| Drove alone to work | 66.5%±17.5 pts | 50.1% |
| Carpooled | 0.0%±14.7 pts | 7.7% |
| Public transportation | 0.0%±14.7 pts | 6.2% |
| Walked | 0.0%±14.7 pts | 3.2% |
| Worked from home | 33.5%±17.5 pts | 30.8% |
| Mean travel time to work | 26.9 min±10.3 | 30.6 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 3511.05 compare with the other tracts in Contra Costa County?
Among Contra Costa County's tracts with a reliable estimate, Census Tract 3511.05 ranks as shown below (1 = highest).
| Measure | In Contra Costa County | In Walnut Creek |
|---|---|---|
| Population | 237th of 241 | 19th of 20 |
| Residents per square mile | 102nd of 241 | 6th of 20 |
| Median household income | 224th of 239 | 19th of 20 |
| Per capita income | 115th of 241 | 20th of 20 |
| Median home value | 227th of 236 | 20th of 20 |
| Median gross rent | 214th of 236 | 17th of 19 |
| Bachelor's degree or higher | 61st of 239 | 14th of 20 |
| Median age | 2nd of 241 | 2nd of 20 |
| Owner-occupied share | 41st of 240 | 7th of 20 |
The tracts next to it on Contra Costa County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3120 | 221st | $71,375±$28,553 · within the margin of this tract |
| Tract 3361.03 | 222nd | $70,221±$13,445 · within the margin of this tract |
| Tract 3690.02 | 223rd | $69,640±$31,008 · within the margin of this tract |
| Tract 3511.05 | 224th | $69,375±$24,656 |
| Tract 3790 | 225th | $68,963±$27,154 · within the margin of this tract |
| Tract 3361.04 | 226th | $68,182±$7,609 · within the margin of this tract |
| Tract 3680.02 | 227th | $67,266±$22,367 · 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 3511.05?
3 of the 18 figures for Census Tract 3511.05 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