Census tract · Contra Costa County
Census Tract 3521.01, Contra Costa County, California
Census Tract 3521.01, GEOID 06013352101, in Contra Costa County, California, mostly within Moraga (69% of its census blocks). 3,579 residents in the ACS 2020-2024 5-year estimates (±313); the 2020 Census counted 3,344.
Residents, 2020-2024
3,579
±313 (90% margin)
2020 Census count: 3,344
Median household income
$223,281
±$60,205 (90% margin)
Contra Costa County: $127,229
Median home value
$1,881,500
±$120,465 (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 3521.01?
Census Tract 3521.01 is one of 242 census tracts in Contra Costa County, California. It covers 4.56 square miles of land, 734 residents per square mile in 2020. Its GEOID, 06013352101, names it uniquely (how tract numbers and GEOIDs work).
7 census tracts border Census Tract 3521.01: Tract 3452.03 ($203,304), Tract 3452.04 ($250,000 or more), Tract 3500 ($192,961), Tract 3511.01 ($81,921), Tract 3512 ($250,000 or more), Tract 3521.02 ($250,000 or more) and Tract 3522.01 ($182,760). 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 3521.01?
The 2020-2024 American Community Survey puts Census Tract 3521.01's population at 3,579 (±313) in 872 households; the 2020 Census counted 3,344 residents and 927 housing units.
| Measure | Tract 3521.01 | Moraga |
|---|---|---|
| Total population | 3,579±313 | 16,769 |
| Households | 872±99 | 5,549 |
| Average household size | 2.99±0.20 | 2.73 |
| Housing units | 911±93 | 5,719 |
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 3521.01?
The median resident of Census Tract 3521.01 is 33.5 years old; 15.9% are under 18 and 16.3% are 65 or older. The largest group is non-Hispanic white residents at 56.0%, then non-Hispanic Asian residents at 21.1%. 15.8% of residents were born outside the United States.
| Measure | Tract 3521.01 | Moraga |
|---|---|---|
| Median age | 33.5±5.2 | 40.1 |
| Under 18 years | 15.9%±1.8 pts | 22.7% |
| 65 years and over | 16.3%±2.8 pts | 19.8% |
| Hispanic or Latino (any race) | 11.4%±4.0 pts | 9.1% |
| White alone, not Hispanic | 56.0%±6.5 pts | 59.2% |
| Black or African American alone, not Hispanic | 2.7%±1.4 pts | 1.4% |
| Asian alone, not Hispanic | 21.1%±5.4 pts | 22.1% |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.4 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.6%±0.7 pts | 0.1% |
| Two or more races, not Hispanic | 6.6%±2.9 pts | 7.3% |
| Some other race alone, not Hispanic | 1.5%±1.2 pts | 0.7% |
| Born outside the United States | 15.8%±3.1 pts | 20.0% |
| Speak a language other than English at home (age 5+) | 21.3%±3.7 pts | 23.9% |
| Civilian veterans (age 18+) | 3.9%±1.7 pts | 4.5% |
| With a disability | 7.7%±2.4 pts | 6.5% |
| No health insurance coverage | 2.4%±2.4 pts | 1.1% |
| High school graduate or higher (age 25+) | 96.9%±2.1 pts | 98.9% |
| Bachelor's degree or higher (age 25+) | 78.7%±4.3 pts | 81.8% |
| Graduate or professional degree (age 25+) | 36.0%±5.8 pts | 41.2% |
| Lived in the same house a year earlier | 84.1%±4.4 pts | 84.8% |
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 3521.01 earn?
Half of the 872 households in Census Tract 3521.01 earn less than $223,281 a year (±$60,205), against $127,229 across Contra Costa County: 27th highest of the county's 239 tracts with a reliable estimate. 6.3% of residents live below the poverty line.
| Measure | Tract 3521.01 | Moraga |
|---|---|---|
| Median household income | $223,281±$60,205 | $216,193 |
| Mean household income | $281,028±$34,746 | $280,129 |
| Per capita income | $71,545±$9,266 | $94,211 |
| People below the poverty line | 6.3%±4.0 pts | 7.3% |
| Children under 18 below the poverty line | 3.6%±5.6 pts | 3.8% |
| Households receiving SNAP | 1.0%±1.3 pts | 0.8% |
| Households with a computer | 100.0%±4.8 pts | 98.6% |
| Households with a broadband subscription | 96.7%±5.2 pts | 98.4% |
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 3521.01?
Owners occupy 83.3% of Census Tract 3521.01's occupied homes and renters 16.7%. The median owner-occupied home is valued at $1,881,500 by its owner (±$120,465). The median renter pays $3,500 or more a month including utilities.
| Measure | Tract 3521.01 | Moraga |
|---|---|---|
| Median home value (owner-occupied) | $1,881,500±$120,465 | $1,663,200 |
| Median gross rent | $3,500 or more | $2,895 |
| Renters paying 35% or more of income on rent | 5.0%±10.2 pts | 54.0% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $4,000 or more |
| Owner-occupied homes | 83.3%±6.7 pts | 83.1% |
| Renter-occupied homes | 16.7%±6.7 pts | 16.9% |
| Housing units | 911±93 | 5,719 |
| Single-family detached homes | 79.9%±6.1 pts | 66.8% |
| Mobile homes | 0.0%±4.6 pts | 1.5% |
| Built 2020 or later | 0.0%±4.6 pts | 0.2% |
| Built 2010 to 2019 | 9.5%±5.7 pts | 3.4% |
| Built 1939 or earlier | 1.5%±1.6 pts | 1.1% |
| Households with no vehicle | 1.5%±1.5 pts | 0.8% |
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 3521.01 get to work?
41.6% of Census Tract 3521.01's workers drive alone and 28.4% work from home. The average trip to work takes 30.1 minutes. The unemployment rate in 2020-2024 averaged 12.3%.
| Measure | Tract 3521.01 | Moraga |
|---|---|---|
| In the labor force (age 16+) | 48.6%±5.0 pts | 57.9% |
| Unemployment rate | 12.3%±5.6 pts | 6.4% |
| Drove alone to work | 41.6%±6.9 pts | 43.4% |
| Carpooled | 6.3%±4.1 pts | 5.6% |
| Public transportation | 6.6%±3.3 pts | 4.2% |
| Walked | 14.2%±5.3 pts | 5.5% |
| Worked from home | 28.4%±6.9 pts | 39.8% |
| Mean travel time to work | 30.1 min±4.1 | 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 3521.01 compare with the other tracts in Contra Costa County?
Among Contra Costa County's tracts with a reliable estimate, Census Tract 3521.01 ranks as shown below (1 = highest).
| Measure | In Contra Costa County | In Moraga |
|---|---|---|
| Population | 177th of 241 | 3rd of 4 |
| Residents per square mile | 220th of 241 | 2nd of 4 |
| Median household income | 27th of 239 | 2nd of 4 |
| Per capita income | 77th of 241 | 4th of 4 |
| Median home value | 14th of 236 | 1st of 4 |
| Median gross rent | 1st of 236 | 1st of 4 |
| Poverty rate | 99th of 134 | 1st of 1 |
| Bachelor's degree or higher | 22nd of 239 | 4th of 4 |
| Median age | 220th of 241 | 4th of 4 |
| Owner-occupied share | 72nd of 240 | 3rd of 4 |
The tracts next to it on Contra Costa County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3540.01 | 24th | $231,108±$25,540 · within the margin of this tract |
| Tract 3451.15 | 25th | $226,595±$28,402 · within the margin of this tract |
| Tract 3451.13 | 26th | $225,625±$39,227 · within the margin of this tract |
| Tract 3521.01 | 27th | $223,281±$60,205 |
| Tract 3383.01 | 28th | $218,191±$35,697 · within the margin of this tract |
| Tract 3451.12 | 29th | $216,774±$54,161 · within the margin of this tract |
| Tract 3382.01 | 30th | $213,929±$51,186 · 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 3521.01?
Every figure for Census Tract 3521.01 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