Census tract · Alameda County
Census Tract 4351.03, Alameda County, California
Census Tract 4351.03, GEOID 06001435103, in Alameda County, California, partly within Castro Valley, Hayward, Fairview, Sunol and Union City. 7,020 residents in the ACS 2020-2024 5-year estimates (±941); the 2020 Census counted 7,726.
Residents, 2020-2024
7,020
±941 (90% margin)
2020 Census count: 7,726
Median household income
$189,638
±$38,671 (90% margin)
Alameda County: $129,367
Median home value
$1,506,100
±$143,069 (90% margin)
Alameda County: $1,090,100
Median gross rent
$3,500 or more
The survey's top or bottom value; no margin is published
Alameda County: $2,357
Where is Census Tract 4351.03?
Census Tract 4351.03 is one of 379 census tracts in Alameda County, California. It covers 20.00 square miles of land, 386 residents per square mile in 2020. Its GEOID, 06001435103, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Castro Valley | 39% |
| Hayward | 25% |
| Fairview | 8% |
| Sunol | 5% |
| Union City | 4% |
9 census tracts border Census Tract 4351.03: Tract 4301.01 ($214,477), Tract 4351.02 ($134,902), Tract 4351.04 ($123,049), Tract 4352 ($142,574), Tract 4364.02 ($176,750), Tract 4401 ($111,607), Tract 4411 ($169,113), Tract 4506.01 ($231,696) and Tract 4507.01 ($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 4351.03?
The 2020-2024 American Community Survey puts Census Tract 4351.03's population at 7,020 (±941) in 2,414 households; the 2020 Census counted 7,726 residents and 2,550 housing units.
| Measure | Tract 4351.03 | Alameda County |
|---|---|---|
| Total population | 7,020 ±941 | 1,649,473 |
| Households | 2,414 ±207 | 598,246 |
| Average household size | 2.89 ±0.27 | 2.70 |
| Housing units | 2,500 ±201 | 637,212 |
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 4351.03?
The median resident of Census Tract 4351.03 is 50.9 years old; 16.7% are under 18 and 19.8% are 65 or older. The largest group is non-Hispanic Asian residents at 47.4%, then non-Hispanic white residents at 30.5%. 42.6% of residents were born outside the United States.
| Measure | Tract 4351.03 | Alameda County |
|---|---|---|
| Median age | 50.9 ±4.8 | 39.0 |
| Under 18 years | 16.7% ±2.9 pts | 19.8% |
| 65 years and over | 19.8% ±3.0 pts | 15.4% |
| Hispanic or Latino (any race) | 10.5% ±3.1 pts | 23.4% |
| White alone, not Hispanic | 30.5% ±7.2 pts | 27.4% |
| Black or African American alone, not Hispanic | 7.2% ±2.7 pts | 9.3% |
| Asian alone, not Hispanic | 47.4% ±7.0 pts | 32.7% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.6 pts | 0.2% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.3% ±0.3 pts | 0.7% |
| Two or more races, not Hispanic | 4.2% ±2.6 pts | 5.6% |
| Some other race alone, not Hispanic | 0.0% ±0.6 pts | 0.6% |
| Born outside the United States | 42.6% ±6.5 pts | 34.7% |
| Speak a language other than English at home (age 5+) | 49.5% ±7.7 pts | 47.2% |
| Civilian veterans (age 18+) | 4.0% ±3.9 pts | 3.0% |
| With a disability | 8.5% ±3.3 pts | 10.3% |
| No health insurance coverage | 1.2% ±1.0 pts | 4.0% |
| High school graduate or higher (age 25+) | 94.5% ±2.2 pts | 88.8% |
| Bachelor's degree or higher (age 25+) | 67.3% ±7.1 pts | 52.2% |
| Graduate or professional degree (age 25+) | 26.7% ±6.6 pts | 23.4% |
| Lived in the same house a year earlier | 92.6% ±3.8 pts | 87.9% |
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 4351.03 earn?
Half of the 2,414 households in Census Tract 4351.03 earn less than $189,638 a year (±$38,671), against $129,367 across Alameda County: 78th highest of the county's 372 tracts with a reliable estimate. 4.4% of residents live below the poverty line.
| Measure | Tract 4351.03 | Alameda County |
|---|---|---|
| Median household income | $189,638 ±$38,671 | $129,367 |
| Mean household income | $232,530 ±$27,717 | $177,144 |
| Per capita income | $80,735 ±$7,949 | $65,862 |
| People below the poverty line | 4.4% ±2.1 pts | 9.2% |
| Children under 18 below the poverty line | 3.0% ±4.2 pts | 8.8% |
| Households receiving SNAP | 2.5% ±2.3 pts | 9.9% |
| Households with a computer | 97.9% ±2.1 pts | 97.4% |
| Households with a broadband subscription | 98.6% ±1.6 pts | 94.4% |
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 4351.03?
Owners occupy 96.5% of Census Tract 4351.03's occupied homes and renters 3.5%. The median owner-occupied home is valued at $1,506,100 by its owner (±$143,069). The median renter pays $3,500 or more a month including utilities.
| Measure | Tract 4351.03 | Alameda County |
|---|---|---|
| Median home value (owner-occupied) | $1,506,100 ±$143,069 | $1,090,100 |
| Median gross rent | $3,500 or more | $2,357 |
| Renters paying 35% or more of income on rent | 37.0% ±63.0 pts | 41.8% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $3,810 |
| Owner-occupied homes | 96.5% ±3.0 pts | 54.4% |
| Renter-occupied homes | 3.5% ±3.0 pts | 45.6% |
| Housing units | 2,500 ±201 | 637,212 |
| Single-family detached homes | 92.1% ±3.2 pts | 51.0% |
| Mobile homes | 0.9% ±1.1 pts | 1.3% |
| Built 2020 or later | 2.2% ±2.0 pts | 1.4% |
| Built 2010 to 2019 | 15.0% ±7.8 pts | 6.8% |
| Built 1939 or earlier | 2.5% ±2.4 pts | 19.6% |
| Households with no vehicle | 1.4% ±1.6 pts | 10.0% |
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 4351.03 get to work?
54.8% of Census Tract 4351.03's workers drive alone and 30.0% work from home. The average trip to work takes 35.8 minutes. The unemployment rate in 2020-2024 averaged 6.1%.
| Measure | Tract 4351.03 | Alameda County |
|---|---|---|
| In the labor force (age 16+) | 63.8% ±4.4 pts | 66.9% |
| Unemployment rate | 6.1% ±3.0 pts | 5.4% |
| Drove alone to work | 54.8% ±8.5 pts | 52.6% |
| Carpooled | 7.5% ±3.7 pts | 8.3% |
| Public transportation | 7.7% ±4.4 pts | 7.7% |
| Walked | 0.0% ±1.2 pts | 2.8% |
| Worked from home | 30.0% ±8.3 pts | 25.7% |
| Mean travel time to work | 35.8 min ±3.9 | 31.0 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 4351.03 compare with the other tracts in Alameda County?
Among Alameda County's tracts with a reliable estimate, Census Tract 4351.03 ranks as shown below (1 = highest).
| Measure | In Alameda County |
|---|---|
| Population | 27th of 375 |
| Residents per square mile | 368th of 378 |
| Median household income | 78th of 372 |
| Per capita income | 105th of 377 |
| Median home value | 54th of 366 |
| Median gross rent | 1st of 368 |
| Poverty rate | 223rd of 263 |
| Bachelor's degree or higher | 106th of 376 |
| Median age | 13th of 377 |
| Owner-occupied share | 2nd of 366 |
The tracts next to it on Alameda County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 4287 | 75th | $191,528±$54,118 · within the margin of this tract |
| Tract 4419.24 | 76th | $190,826±$13,680 · within the margin of this tract |
| Tract 4081 | 77th | $189,891±$50,131 · within the margin of this tract |
| Tract 4351.03 | 78th | $189,638±$38,671 |
| Tract 4321 | 79th | $188,409±$31,803 · within the margin of this tract |
| Tract 4100 | 80th | $188,203±$31,944 · within the margin of this tract |
| Tract 4363.01 | 81st | $187,333±$63,708 · 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 4351.03?
Every figure for Census Tract 4351.03 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