Census tract · Alameda County
Census Tract 4305, Alameda County, California
Census Tract 4305, GEOID 06001430500, in Alameda County, California, entirely within Castro Valley. 6,125 residents in the ACS 2020-2024 5-year estimates (±1,016); the 2020 Census counted 6,289.
Residents, 2020-2024
6,125
±1,016 (90% margin)
2020 Census count: 6,289
Median household income
$114,408
±$21,284 (90% margin)
Alameda County: $129,367
Median home value
$908,200
±$58,547 (90% margin)
Alameda County: $1,090,100
Median gross rent
$2,366
±$284 (90% margin)
Alameda County: $2,357
Where is Census Tract 4305?
Census Tract 4305 is one of 379 census tracts in Alameda County, California. It covers 1.01 square miles of land, 6,245 residents per square mile in 2020. Its GEOID, 06001430500, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Castro Valley | 100% |
9 census tracts border Census Tract 4305: Tract 4304 ($193,958), Tract 4306 ($193,606), Tract 4310 ($103,750), Tract 4312 ($122,872), Tract 4328 ($134,211), Tract 4337 ($84,107), Tract 4338.01 ($102,500), Tract 4339 ($80,854) and Tract 4340 ($52,160). 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 4305?
The 2020-2024 American Community Survey puts Census Tract 4305's population at 6,125 (±1,016) in 1,983 households; the 2020 Census counted 6,289 residents and 2,256 housing units.
| Measure | Tract 4305 | Castro Valley |
|---|---|---|
| Total population | 6,125 ±1,016 | 65,001 |
| Households | 1,983 ±224 | 22,021 |
| Average household size | 2.87 ±0.45 | 2.90 |
| Housing units | 2,124 ±199 | 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 4305?
The median resident of Census Tract 4305 is 39.6 years old; 16.7% are under 18 and 14.6% are 65 or older. The largest group is non-Hispanic Black residents at 27.2%, then non-Hispanic Asian residents at 25.0%. 36.6% of residents were born outside the United States.
| Measure | Tract 4305 | Castro Valley |
|---|---|---|
| Median age | 39.6 ±7.7 | 42.9 |
| Under 18 years | 16.7% ±7.1 pts | 20.8% |
| 65 years and over | 14.6% ±4.4 pts | 18.8% |
| Hispanic or Latino (any race) | 18.3% ±7.5 pts | 19.8% |
| White alone, not Hispanic | 22.4% ±7.7 pts | 33.5% |
| Black or African American alone, not Hispanic | 27.2% ±15.0 pts | 8.7% |
| Asian alone, not Hispanic | 25.0% ±5.7 pts | 32.9% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.7 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.1% ±0.2 pts | 0.3% |
| Two or more races, not Hispanic | 7.0% ±4.4 pts | 4.6% |
| Some other race alone, not Hispanic | 0.0% ±0.7 pts | 0.2% |
| Born outside the United States | 36.6% ±11.9 pts | 31.0% |
| Speak a language other than English at home (age 5+) | 36.3% ±9.2 pts | 42.2% |
| Civilian veterans (age 18+) | 3.9% ±2.3 pts | 3.9% |
| With a disability | 10.9% ±2.8 pts | 9.8% |
| No health insurance coverage | 4.3% ±3.5 pts | 3.3% |
| High school graduate or higher (age 25+) | 89.1% ±5.9 pts | 91.7% |
| Bachelor's degree or higher (age 25+) | 35.8% ±9.6 pts | 44.5% |
| Graduate or professional degree (age 25+) | 10.9% ±5.4 pts | 17.5% |
| Lived in the same house a year earlier | 88.0% ±4.1 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 4305 earn?
Half of the 1,983 households in Census Tract 4305 earn less than $114,408 a year (±$21,284), against $129,367 across Alameda County: 217th highest of the county's 372 tracts with a reliable estimate. 10.2% of residents live below the poverty line.
| Measure | Tract 4305 | Castro Valley |
|---|---|---|
| Median household income | $114,408 ±$21,284 | $142,779 |
| Mean household income | $140,287 ±$25,828 | $175,307 |
| Per capita income | $49,879 ±$9,826 | $60,688 |
| People below the poverty line | 10.2% ±5.9 pts | 6.7% |
| Children under 18 below the poverty line | 3.0% ±5.8 pts | 5.8% |
| Households receiving SNAP | 5.7% ±5.5 pts | 6.7% |
| Households with a computer | 93.7% ±8.9 pts | 97.4% |
| Households with a broadband subscription | 99.1% ±1.4 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 4305?
Owners occupy 66.3% of Census Tract 4305's occupied homes and renters 33.7%. The median owner-occupied home is valued at $908,200 by its owner (±$58,547). The median renter pays $2,366 a month including utilities, and 49.1% of renters pay 35% or more of their income on rent.
| Measure | Tract 4305 | Castro Valley |
|---|---|---|
| Median home value (owner-occupied) | $908,200 ±$58,547 | $1,104,600 |
| Median gross rent | $2,366 ±$284 | $2,554 |
| Renters paying 35% or more of income on rent | 49.1% ±23.0 pts | 45.6% |
| Median monthly owner costs, with a mortgage | $3,186 ±$276 | $3,627 |
| Owner-occupied homes | 66.3% ±11.0 pts | 72.5% |
| Renter-occupied homes | 33.7% ±11.0 pts | 27.5% |
| Housing units | 2,124 ±199 | 22,957 |
| Single-family detached homes | 70.1% ±8.4 pts | 73.3% |
| Mobile homes | 0.0% ±2.0 pts | 1.5% |
| Built 2020 or later | 2.8% ±3.6 pts | 0.7% |
| Built 2010 to 2019 | 5.6% ±4.9 pts | 2.5% |
| Built 1939 or earlier | 2.4% ±2.9 pts | 3.1% |
| Households with no vehicle | 2.2% ±3.6 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 4305 get to work?
58.2% of Census Tract 4305's workers drive alone and 16.4% work from home. The average trip to work takes 34.3 minutes.
| Measure | Tract 4305 | Castro Valley |
|---|---|---|
| In the labor force (age 16+) | 67.5% ±5.8 pts | 64.1% |
| Unemployment rate | 4.2% ±3.0 pts | 3.8% |
| Drove alone to work | 58.2% ±11.8 pts | 62.5% |
| Carpooled | 8.1% ±5.5 pts | 7.7% |
| Public transportation | 15.6% ±12.6 pts | 5.2% |
| Walked | 0.9% ±1.4 pts | 1.4% |
| Worked from home | 16.4% ±5.9 pts | 21.3% |
| Mean travel time to work | 34.3 min ±6.0 | 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 4305 compare with the other tracts in Alameda County?
Among Alameda County's tracts with a reliable estimate, Census Tract 4305 ranks as shown below (1 = highest).
| Measure | In Alameda County | In Castro Valley |
|---|---|---|
| Population | 58th of 375 | 4th of 14 |
| Residents per square mile | 273rd of 378 | 8th of 14 |
| Median household income | 217th of 372 | 11th of 14 |
| Per capita income | 254th of 377 | 11th of 14 |
| Median home value | 224th of 366 | 11th of 14 |
| Median gross rent | 204th of 368 | 13th of 14 |
| Poverty rate | 121st of 263 | 2nd of 8 |
| Bachelor's degree or higher | 284th of 376 | 11th of 14 |
| Median age | 194th of 377 | 12th of 14 |
| Owner-occupied share | 140th of 366 | 10th of 14 |
The tracts next to it on Alameda County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 4217 | 214th | $115,139±$31,170 · within the margin of this tract |
| Tract 4035.02 | 215th | $115,000±$24,417 · within the margin of this tract |
| Tract 4403.33 | 216th | $114,760±$11,277 · within the margin of this tract |
| Tract 4305 | 217th | $114,408±$21,284 |
| Tract 4403.31 | 218th | $114,126±$12,210 · within the margin of this tract |
| Tract 4354 | 219th | $113,177±$29,960 · within the margin of this tract |
| Tract 4417.02 | 220th | $113,125±$39,190 · 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 4305?
Every figure for Census Tract 4305 on this page has a coefficient of variation under 40%, the Census Bureau's threshold for a usable estimate.
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