Census tract · Alameda County
Census Tract 4304, Alameda County, California
Census Tract 4304, GEOID 06001430400, in Alameda County, California, entirely within Castro Valley. 2,160 residents in the ACS 2020-2024 5-year estimates (±231); the 2020 Census counted 2,207.
Residents, 2020-2024
2,160
±231 (90% margin)
2020 Census count: 2,207
Median household income
$193,958
±$44,141 (90% margin)
Alameda County: $129,367
Median home value
$1,165,100
±$35,165 (90% margin)
Alameda County: $1,090,100
Median gross rent
$3,218
±$168 (90% margin)
Alameda County: $2,357
Where is Census Tract 4304?
Census Tract 4304 is one of 379 census tracts in Alameda County, California. It covers 0.94 square miles of land, 2,350 residents per square mile in 2020. Its GEOID, 06001430400, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Castro Valley | 100% |
7 census tracts border Census Tract 4304: Tract 4100 ($188,203), Tract 4301.02 ($192,426), Tract 4303 ($175,772), Tract 4305 ($114,408), Tract 4306 ($193,606), Tract 4307 ($145,521) and Tract 4328 ($134,211). 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 4304?
The 2020-2024 American Community Survey puts Census Tract 4304's population at 2,160 (±231) in 707 households; the 2020 Census counted 2,207 residents and 767 housing units.
| Measure | Tract 4304 | Castro Valley |
|---|---|---|
| Total population | 2,160±231 | 65,001 |
| Households | 707±64 | 22,021 |
| Average household size | 3.06±0.19 | 2.90 |
| Housing units | 716±64 | 22,957 |
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 4304?
The median resident of Census Tract 4304 is 44.0 years old; 21.3% are under 18 and 17.0% are 65 or older. The largest group is non-Hispanic Asian residents at 45.6%, then non-Hispanic white residents at 35.2%. 29.1% of residents were born outside the United States.
| Measure | Tract 4304 | Castro Valley |
|---|---|---|
| Median age | 44.0±3.4 | 42.9 |
| Under 18 years | 21.3%±2.7 pts | 20.8% |
| 65 years and over | 17.0%±3.1 pts | 18.8% |
| Hispanic or Latino (any race) | 10.2%±4.8 pts | 19.8% |
| White alone, not Hispanic | 35.2%±9.5 pts | 33.5% |
| Black or African American alone, not Hispanic | 3.0%±3.1 pts | 8.7% |
| Asian alone, not Hispanic | 45.6%±10.9 pts | 32.9% |
| 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 | 0.3% |
| Two or more races, not Hispanic | 6.0%±2.7 pts | 4.6% |
| Some other race alone, not Hispanic | 0.0%±1.9 pts | 0.2% |
| Born outside the United States | 29.1%±7.5 pts | 31.0% |
| Speak a language other than English at home (age 5+) | 45.2%±8.3 pts | 42.2% |
| Civilian veterans (age 18+) | 4.4%±1.8 pts | 3.9% |
| With a disability | 5.3%±2.1 pts | 9.8% |
| No health insurance coverage | 0.3%±0.5 pts | 3.3% |
| High school graduate or higher (age 25+) | 96.9%±2.0 pts | 91.7% |
| Bachelor's degree or higher (age 25+) | 67.1%±5.3 pts | 44.5% |
| Graduate or professional degree (age 25+) | 29.7%±5.9 pts | 17.5% |
| Lived in the same house a year earlier | 98.0%±1.5 pts | 92.1% |
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 4304 earn?
Half of the 707 households in Census Tract 4304 earn less than $193,958 a year (±$44,141), against $129,367 across Alameda County: 70th highest of the county's 372 tracts with a reliable estimate.
| Measure | Tract 4304 | Castro Valley |
|---|---|---|
| Median household income | $193,958±$44,141 | $142,779 |
| Mean household income | $222,125±$24,091 | $175,307 |
| Per capita income | $74,295±$7,857 | $60,688 |
| People below the poverty line | 2.5%±2.2 pts | 6.7% |
| Children under 18 below the poverty line | 0.0%±8.8 pts | 5.8% |
| Households receiving SNAP | 4.7%±3.7 pts | 6.7% |
| Households with a computer | 99.7%±0.5 pts | 97.4% |
| Households with a broadband subscription | 95.9%±5.0 pts | 96.7% |
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 4304?
Owners occupy 91.4% of Census Tract 4304's occupied homes and renters 8.6%. The median owner-occupied home is valued at $1,165,100 by its owner (±$35,165). The median renter pays $3,218 a month including utilities.
| Measure | Tract 4304 | Castro Valley |
|---|---|---|
| Median home value (owner-occupied) | $1,165,100±$35,165 | $1,104,600 |
| Median gross rent | $3,218±$168 | $2,554 |
| Renters paying 35% or more of income on rent | 49.0%±39.9 pts | 45.6% |
| Median monthly owner costs, with a mortgage | $3,837±$388 | $3,627 |
| Owner-occupied homes | 91.4%±5.4 pts | 72.5% |
| Renter-occupied homes | 8.6%±5.4 pts | 27.5% |
| Housing units | 716±64 | 22,957 |
| Single-family detached homes | 98.3%±1.6 pts | 73.3% |
| Mobile homes | 0.0%±5.8 pts | 1.5% |
| Built 2020 or later | 0.0%±5.8 pts | 0.7% |
| Built 2010 to 2019 | 0.0%±5.8 pts | 2.5% |
| Built 1939 or earlier | 1.3%±1.9 pts | 3.1% |
| Households with no vehicle | 4.7%±5.1 pts | 5.5% |
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 4304 get to work?
49.6% of Census Tract 4304's workers drive alone and 28.3% work from home. The average trip to work takes 38.0 minutes.
| Measure | Tract 4304 | Castro Valley |
|---|---|---|
| In the labor force (age 16+) | 70.0%±5.5 pts | 64.1% |
| Unemployment rate | 6.8%±4.9 pts | 3.8% |
| Drove alone to work | 49.6%±8.0 pts | 62.5% |
| Carpooled | 12.0%±4.2 pts | 7.7% |
| Public transportation | 6.4%±3.1 pts | 5.2% |
| Walked | 1.0%±1.2 pts | 1.4% |
| Worked from home | 28.3%±7.3 pts | 21.3% |
| Mean travel time to work | 38.0 min±5.1 | 32.7 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 4304 compare with the other tracts in Alameda County?
Among Alameda County's tracts with a reliable estimate, Census Tract 4304 ranks as shown below (1 = highest).
| Measure | In Alameda County | In Castro Valley |
|---|---|---|
| Population | 354th of 375 | 14th of 14 |
| Residents per square mile | 341st of 378 | 11th of 14 |
| Median household income | 70th of 372 | 2nd of 14 |
| Per capita income | 151st of 377 | 5th of 14 |
| Median home value | 132nd of 366 | 6th of 14 |
| Median gross rent | 67th of 368 | 3rd of 14 |
| Bachelor's degree or higher | 109th of 376 | 2nd of 14 |
| Median age | 94th of 377 | 7th of 14 |
| Owner-occupied share | 18th of 366 | 5th of 14 |
The tracts next to it on Alameda County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 4507.45 | 67th | $198,147±$27,793 · within the margin of this tract |
| Tract 4201 | 68th | $197,813±$49,753 · within the margin of this tract |
| Tract 9832 | 69th | $196,688±$51,818 · within the margin of this tract |
| Tract 4304 | 70th | $193,958±$44,141 |
| Tract 4306 | 71st | $193,606±$28,686 · within the margin of this tract |
| Tract 4414.01 | 72nd | $192,500±$42,332 · within the margin of this tract |
| Tract 4301.02 | 73rd | $192,426±$24,621 · 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 4304?
2 of the 18 figures for Census Tract 4304 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