Census tract · Contra Costa County
Census Tract 3400.03, Contra Costa County, California
Census Tract 3400.03, GEOID 06013340003, in Contra Costa County, California, mostly within Walnut Creek (83% of its census blocks). 3,318 residents in the ACS 2020-2024 5-year estimates (±408); the 2020 Census counted 3,644.
Residents, 2020-2024
3,318
±408 (90% margin)
2020 Census count: 3,644
Median household income
$164,063
±$56,407 (90% margin)
Contra Costa County: $127,229
Median home value
$1,184,100
±$84,362 (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 3400.03?
Census Tract 3400.03 is one of 242 census tracts in Contra Costa County, California. It covers 0.97 square miles of land, 3,745 residents per square mile in 2020. Its GEOID, 06013340003, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Walnut Creek | 83% |
| Reliez Valley | 17% |
5 census tracts border Census Tract 3400.03: Tract 3250 ($149,773), Tract 3260 ($175,855), Tract 3400.01 ($142,723), Tract 3400.04 ($171,218) and Tract 3470 ($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 3400.03?
The 2020-2024 American Community Survey puts Census Tract 3400.03's population at 3,318 (±408) in 1,501 households; the 2020 Census counted 3,644 residents and 1,563 housing units.
| Measure | Tract 3400.03 | Walnut Creek |
|---|---|---|
| Total population | 3,318±408 | 70,088 |
| Households | 1,501±170 | 33,072 |
| Average household size | 2.19±0.16 | 2.09 |
| Housing units | 1,511±170 | 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 3400.03?
The median resident of Census Tract 3400.03 is 41.7 years old; 20.4% are under 18 and 21.6% are 65 or older. The largest group is non-Hispanic white residents at 66.4%, then non-Hispanic Asian residents at 18.6%. 20.0% of residents were born outside the United States.
| Measure | Tract 3400.03 | Walnut Creek |
|---|---|---|
| Median age | 41.7±5.6 | 46.8 |
| Under 18 years | 20.4%±5.8 pts | 15.5% |
| 65 years and over | 21.6%±3.1 pts | 29.5% |
| Hispanic or Latino (any race) | 9.2%±3.8 pts | 12.4% |
| White alone, not Hispanic | 66.4%±7.9 pts | 61.3% |
| Black or African American alone, not Hispanic | 1.1%±1.2 pts | 1.8% |
| Asian alone, not Hispanic | 18.6%±7.2 pts | 17.1% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.3 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.3 pts | 0.1% |
| Two or more races, not Hispanic | 4.6%±2.7 pts | 6.5% |
| Some other race alone, not Hispanic | 0.2%±1.4 pts | 0.8% |
| Born outside the United States | 20.0%±5.6 pts | 24.4% |
| Speak a language other than English at home (age 5+) | 20.0%±5.5 pts | 27.8% |
| Civilian veterans (age 18+) | 6.8%±4.4 pts | 5.6% |
| With a disability | 9.2%±3.5 pts | 12.8% |
| No health insurance coverage | 1.3%±1.4 pts | 2.3% |
| High school graduate or higher (age 25+) | 96.8%±2.1 pts | 97.2% |
| Bachelor's degree or higher (age 25+) | 66.7%±6.4 pts | 70.4% |
| Graduate or professional degree (age 25+) | 29.5%±6.7 pts | 30.6% |
| Lived in the same house a year earlier | 88.5%±6.0 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 3400.03 earn?
Half of the 1,501 households in Census Tract 3400.03 earn less than $164,063 a year (±$56,407), against $127,229 across Contra Costa County: 68th highest of the county's 239 tracts with a reliable estimate. 13.4% of residents live below the poverty line.
| Measure | Tract 3400.03 | Walnut Creek |
|---|---|---|
| Median household income | $164,063±$56,407 | $130,432 |
| Mean household income | $175,202±$23,080 | $179,868 |
| Per capita income | $79,816±$12,764 | $85,521 |
| People below the poverty line | 13.4%±8.7 pts | 6.4% |
| Children under 18 below the poverty line | 27.6%±24.6 pts | 9.0% |
| Households receiving SNAP | 1.1%±1.5 pts | 3.0% |
| Households with a computer | 100.0%±2.8 pts | 98.3% |
| Households with a broadband subscription | 100.0%±2.8 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 3400.03?
Owners occupy 70.3% of Census Tract 3400.03's occupied homes and renters 29.7%. The median owner-occupied home is valued at $1,184,100 by its owner (±$84,362). The median renter pays $3,500 or more a month including utilities.
| Measure | Tract 3400.03 | Walnut Creek |
|---|---|---|
| Median home value (owner-occupied) | $1,184,100±$84,362 | $1,057,300 |
| Median gross rent | $3,500 or more | $2,680 |
| Renters paying 35% or more of income on rent | 41.1%±29.9 pts | 42.1% |
| Median monthly owner costs, with a mortgage | $3,771±$804 | $3,764 |
| Owner-occupied homes | 70.3%±9.5 pts | 64.4% |
| Renter-occupied homes | 29.7%±9.5 pts | 35.6% |
| Housing units | 1,511±170 | 34,389 |
| Single-family detached homes | 52.0%±6.6 pts | 36.8% |
| Mobile homes | 0.0%±2.8 pts | 0.2% |
| Built 2020 or later | 0.0%±2.8 pts | 0.7% |
| Built 2010 to 2019 | 0.8%±1.3 pts | 5.5% |
| Built 1939 or earlier | 4.4%±4.9 pts | 2.2% |
| Households with no vehicle | 5.3%±4.3 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 3400.03 get to work?
50.4% of Census Tract 3400.03's workers drive alone and 37.5% work from home. The average trip to work takes 28.4 minutes.
| Measure | Tract 3400.03 | Walnut Creek |
|---|---|---|
| In the labor force (age 16+) | 65.1%±5.1 pts | 59.2% |
| Unemployment rate | 12.3%±8.7 pts | 6.0% |
| Drove alone to work | 50.4%±7.5 pts | 50.1% |
| Carpooled | 8.7%±6.1 pts | 7.7% |
| Public transportation | 0.7%±1.1 pts | 6.2% |
| Walked | 1.7%±2.2 pts | 3.2% |
| Worked from home | 37.5%±8.0 pts | 30.8% |
| Mean travel time to work | 28.4 min±2.9 | 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 3400.03 compare with the other tracts in Contra Costa County?
Among Contra Costa County's tracts with a reliable estimate, Census Tract 3400.03 ranks as shown below (1 = highest).
| Measure | In Contra Costa County | In Walnut Creek |
|---|---|---|
| Population | 191st of 241 | 13th of 20 |
| Residents per square mile | 142nd of 241 | 9th of 20 |
| Median household income | 68th of 239 | 10th of 20 |
| Per capita income | 62nd of 241 | 13th of 20 |
| Median home value | 61st of 236 | 9th of 20 |
| Median gross rent | 1st of 236 | 1st of 19 |
| Poverty rate | 30th of 134 | 1st of 9 |
| Bachelor's degree or higher | 64th of 239 | 15th of 20 |
| Median age | 107th of 241 | 15th of 20 |
| Owner-occupied share | 137th of 240 | 12th of 20 |
The tracts next to it on Contra Costa County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3551.19 | 65th | $166,528±$49,061 · within the margin of this tract |
| Tract 3031.05 | 66th | $165,625±$47,365 · within the margin of this tract |
| Tract 3382.04 | 67th | $164,107±$24,266 · within the margin of this tract |
| Tract 3400.03 | 68th | $164,063±$56,407 |
| Tract 3430.02 | 69th | $163,771±$12,005 · within the margin of this tract |
| Tract 3032.11 | 70th | $163,385±$28,743 · within the margin of this tract |
| Tract 3553.06 | 71st | $162,019±$23,182 · 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 3400.03?
1 of the 18 figures for Census Tract 3400.03 on this page carries a coefficient of variation over 40% and is 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