Census tract · Contra Costa County
Census Tract 3430.03, Contra Costa County, California
Census Tract 3430.03, GEOID 06013343003, in Contra Costa County, California, mostly within San Miguel (Contra Costa County) (50% of its census blocks). 3,802 residents in the ACS 2020-2024 5-year estimates (±248); the 2020 Census counted 4,045.
Residents, 2020-2024
3,802
±248 (90% margin)
2020 Census count: 4,045
Median household income
$180,500
±$31,782 (90% margin)
Contra Costa County: $127,229
Median home value
$1,767,800
±$100,901 (90% margin)
Contra Costa County: $866,800
Median gross rent
$2,523
±$489 (90% margin)
Contra Costa County: $2,375
Where is Census Tract 3430.03?
Census Tract 3430.03 is one of 242 census tracts in Contra Costa County, California. It covers 2.10 square miles of land, 1,926 residents per square mile in 2020. Its GEOID, 06013343003, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| San Miguel (Contra Costa County) | 50% |
| Walnut Creek | 50% |
6 census tracts border Census Tract 3430.03: Tract 3342 ($189,153), Tract 3383.02 ($207,105), Tract 3390.01 ($96,472), Tract 3430.01 ($173,643), Tract 3430.02 ($163,771) and Tract 3461.01 ($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 3430.03?
The 2020-2024 American Community Survey puts Census Tract 3430.03's population at 3,802 (±248) in 1,414 households; the 2020 Census counted 4,045 residents and 1,550 housing units.
| Measure | Tract 3430.03 | San Miguel (Contra Costa County) |
|---|---|---|
| Total population | 3,802±248 | 3,967 |
| Households | 1,414±78 | 1,330 |
| Average household size | 2.68±0.14 | 2.97 |
| Housing units | 1,414±78 | 1,330 |
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 3430.03?
The median resident of Census Tract 3430.03 is 44.0 years old; 19.3% are under 18 and 26.5% are 65 or older. The largest group is non-Hispanic white residents at 77.1%, then non-Hispanic Asian residents at 9.3%. 11.6% of residents were born outside the United States.
| Measure | Tract 3430.03 | San Miguel (Contra Costa County) |
|---|---|---|
| Median age | 44.0±3.1 | 48.4 |
| Under 18 years | 19.3%±2.4 pts | 23.1% |
| 65 years and over | 26.5%±4.9 pts | 28.4% |
| Hispanic or Latino (any race) | 4.6%±2.6 pts | 5.8% |
| White alone, not Hispanic | 77.1%±6.9 pts | 77.8% |
| Black or African American alone, not Hispanic | 0.9%±0.9 pts | 0.4% |
| Asian alone, not Hispanic | 9.3%±3.5 pts | 5.2% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.1 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.1 pts | 0.0% |
| Two or more races, not Hispanic | 7.8%±5.4 pts | 10.8% |
| Some other race alone, not Hispanic | 0.3%±0.5 pts | 0.0% |
| Born outside the United States | 11.6%±4.0 pts | 7.4% |
| Speak a language other than English at home (age 5+) | 17.8%±4.0 pts | 10.5% |
| Civilian veterans (age 18+) | 2.5%±1.5 pts | 2.7% |
| With a disability | 8.8%±2.7 pts | 8.2% |
| No health insurance coverage | 2.1%±1.4 pts | 2.7% |
| High school graduate or higher (age 25+) | 99.2%±0.7 pts | 99.9% |
| Bachelor's degree or higher (age 25+) | 69.5%±6.2 pts | 70.0% |
| Graduate or professional degree (age 25+) | 32.7%±6.2 pts | 33.2% |
| Lived in the same house a year earlier | 96.2%±2.3 pts | 93.3% |
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 3430.03 earn?
Half of the 1,414 households in Census Tract 3430.03 earn less than $180,500 a year (±$31,782), against $127,229 across Contra Costa County: 50th highest of the county's 239 tracts with a reliable estimate.
| Measure | Tract 3430.03 | San Miguel (Contra Costa County) |
|---|---|---|
| Median household income | $180,500±$31,782 | $250,000 or more |
| Mean household income | $246,407±$28,444 | $299,540 |
| Per capita income | $93,761±$12,548 | $102,938 |
| People below the poverty line | 1.2%±0.8 pts | 1.8% |
| Children under 18 below the poverty line | 0.0%±5.6 pts | 0.0% |
| Households receiving SNAP | 1.7%±2.0 pts | 1.9% |
| Households with a computer | 97.7%±2.6 pts | 99.2% |
| Households with a broadband subscription | 97.1%±2.8 pts | 98.5% |
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 3430.03?
Owners occupy 77.4% of Census Tract 3430.03's occupied homes and renters 22.6%. The median owner-occupied home is valued at $1,767,800 by its owner (±$100,901). The median renter pays $2,523 a month including utilities, and 40.3% of renters pay 35% or more of their income on rent.
| Measure | Tract 3430.03 | San Miguel (Contra Costa County) |
|---|---|---|
| Median home value (owner-occupied) | $1,767,800±$100,901 | $1,649,100 |
| Median gross rent | $2,523±$489 | $2,758 |
| Renters paying 35% or more of income on rent | 40.3%±16.6 pts | 63.6% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $4,000 or more |
| Owner-occupied homes | 77.4%±6.3 pts | 90.4% |
| Renter-occupied homes | 22.6%±6.3 pts | 9.6% |
| Housing units | 1,414±78 | 1,330 |
| Single-family detached homes | 83.3%±5.2 pts | 96.8% |
| Mobile homes | 0.0%±3.0 pts | 0.0% |
| Built 2020 or later | 0.5%±0.8 pts | 0.5% |
| Built 2010 to 2019 | 0.6%±0.9 pts | 1.9% |
| Built 1939 or earlier | 0.0%±3.0 pts | 4.7% |
| Households with no vehicle | 1.1%±1.3 pts | 0.7% |
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 3430.03 get to work?
50.3% of Census Tract 3430.03's workers drive alone and 32.8% work from home. The average trip to work takes 29.6 minutes.
| Measure | Tract 3430.03 | San Miguel (Contra Costa County) |
|---|---|---|
| In the labor force (age 16+) | 61.7%±5.2 pts | 62.1% |
| Unemployment rate | 6.3%±4.2 pts | 5.7% |
| Drove alone to work | 50.3%±7.6 pts | 51.6% |
| Carpooled | 6.9%±5.4 pts | 7.1% |
| Public transportation | 6.7%±3.8 pts | 6.9% |
| Walked | 0.0%±2.4 pts | 0.0% |
| Worked from home | 32.8%±7.3 pts | 32.8% |
| Mean travel time to work | 29.6 min±3.1 | 30.3 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 3430.03 compare with the other tracts in Contra Costa County?
Among Contra Costa County's tracts with a reliable estimate, Census Tract 3430.03 ranks as shown below (1 = highest).
| Measure | In Contra Costa County |
|---|---|
| Population | 167th of 241 |
| Residents per square mile | 185th of 241 |
| Median household income | 50th of 239 |
| Per capita income | 40th of 241 |
| Median home value | 23rd of 236 |
| Median gross rent | 119th of 236 |
| Bachelor's degree or higher | 53rd of 239 |
| Median age | 72nd of 241 |
| Owner-occupied share | 102nd of 240 |
The tracts next to it on Contra Costa County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3381.02 | 47th | $185,556±$15,989 · within the margin of this tract |
| Tract 3522.01 | 48th | $182,760±$68,934 · within the margin of this tract |
| Tract 3451.01 | 49th | $182,332±$12,969 · within the margin of this tract |
| Tract 3430.03 | 50th | $180,500±$31,782 |
| Tract 3840 | 51st | $179,770±$28,111 · within the margin of this tract |
| Tract 3452.05 | 52nd | $176,727±$10,555 · within the margin of this tract |
| Tract 3260 | 53rd | $175,855±$34,564 · 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 3430.03?
2 of the 18 figures for Census Tract 3430.03 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