Census tract · Contra Costa County
Census Tract 3551.13, Contra Costa County, California
Census Tract 3551.13, GEOID 06013355113, in Contra Costa County, California, mostly within Blackhawk (77% of its census blocks). 5,453 residents in the ACS 2020-2024 5-year estimates (±750); the 2020 Census counted 5,000.
Residents, 2020-2024
5,453
±750 (90% margin)
2020 Census count: 5,000
Median household income
$250,000 or more
The survey's top or bottom value; no margin is published
Contra Costa County: $127,229
Median home value
$1,925,100
±$211,281 (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 3551.13?
Census Tract 3551.13 is one of 242 census tracts in Contra Costa County, California. It covers 2.06 square miles of land, 2,431 residents per square mile in 2020. Its GEOID, 06013355113, names it uniquely (how tract numbers and GEOIDs work).
4 census tracts border Census Tract 3551.13: Tract 3462.04 ($250,000 or more), Tract 3551.12 ($206,932), Tract 3551.21 ($250,000 or more) and Tract 3551.22 ($246,979). 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 3551.13?
The 2020-2024 American Community Survey puts Census Tract 3551.13's population at 5,453 (±750) in 1,807 households; the 2020 Census counted 5,000 residents and 1,728 housing units.
| Measure | Tract 3551.13 | Blackhawk |
|---|---|---|
| Total population | 5,453 ±750 | 10,137 |
| Households | 1,807 ±265 | 3,781 |
| Average household size | 3.02 ±0.20 | 2.65 |
| Housing units | 1,860 ±252 | 3,923 |
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 3551.13?
The median resident of Census Tract 3551.13 is 42.9 years old; 24.3% are under 18 and 19.6% are 65 or older. The largest group is non-Hispanic white residents at 51.8%, then non-Hispanic Asian residents at 25.8%. 19.3% of residents were born outside the United States.
| Measure | Tract 3551.13 | Blackhawk |
|---|---|---|
| Median age | 42.9 ±3.9 | 50.3 |
| Under 18 years | 24.3% ±2.9 pts | 18.9% |
| 65 years and over | 19.6% ±3.7 pts | 26.0% |
| Hispanic or Latino (any race) | 6.8% ±3.2 pts | 6.9% |
| White alone, not Hispanic | 51.8% ±9.0 pts | 59.9% |
| Black or African American alone, not Hispanic | 10.6% ±10.7 pts | 5.9% |
| Asian alone, not Hispanic | 25.8% ±4.7 pts | 22.7% |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.2 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.5% ±0.7 pts | 0.2% |
| Two or more races, not Hispanic | 4.2% ±2.5 pts | 3.8% |
| Some other race alone, not Hispanic | 0.1% ±0.1 pts | 0.4% |
| Born outside the United States | 19.3% ±5.2 pts | 22.3% |
| Speak a language other than English at home (age 5+) | 22.3% ±5.4 pts | 25.6% |
| Civilian veterans (age 18+) | 6.2% ±2.9 pts | 5.9% |
| With a disability | 7.1% ±2.8 pts | 6.9% |
| No health insurance coverage | 0.0% ±0.8 pts | 2.1% |
| High school graduate or higher (age 25+) | 99.1% ±0.8 pts | 98.6% |
| Bachelor's degree or higher (age 25+) | 68.9% ±5.9 pts | 69.7% |
| Graduate or professional degree (age 25+) | 31.6% ±5.5 pts | 28.7% |
| Lived in the same house a year earlier | 90.6% ±5.5 pts | 91.8% |
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 3551.13 earn?
Half of the 1,807 households in Census Tract 3551.13 earn less than $250,000 or more a year (), against $127,229 across Contra Costa County: 1st highest of the county's 239 tracts with a reliable estimate.
| Measure | Tract 3551.13 | Blackhawk |
|---|---|---|
| Median household income | $250,000 or more | $245,208 |
| Mean household income | $302,325 ±$47,186 | $349,066 |
| Per capita income | $100,895 ±$15,928 | $130,578 |
| People below the poverty line | 9.1% ±10.1 pts | 5.6% |
| Children under 18 below the poverty line | 11.2% ±13.7 pts | 7.7% |
| Households receiving SNAP | 0.0% ±2.3 pts | 0.0% |
| Households with a computer | 100.0% ±2.3 pts | 99.7% |
| Households with a broadband subscription | 98.9% ±1.2 pts | 98.7% |
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 3551.13?
Owners occupy 90.5% of Census Tract 3551.13's occupied homes and renters 9.5%. The median owner-occupied home is valued at $1,925,100 by its owner (±$211,281). The median renter pays $3,500 or more a month including utilities.
| Measure | Tract 3551.13 | Blackhawk |
|---|---|---|
| Median home value (owner-occupied) | $1,925,100 ±$211,281 | $2,000,000 or more |
| Median gross rent | $3,500 or more | $3,500 or more |
| Renters paying 35% or more of income on rent | 29.7% ±22.6 pts | 34.0% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $4,000 or more |
| Owner-occupied homes | 90.5% ±3.8 pts | 89.3% |
| Renter-occupied homes | 9.5% ±3.8 pts | 10.7% |
| Housing units | 1,860 ±252 | 3,923 |
| Single-family detached homes | 90.4% ±3.5 pts | 91.2% |
| Mobile homes | 0.0% ±2.3 pts | 0.0% |
| Built 2020 or later | 0.0% ±2.3 pts | 0.0% |
| Built 2010 to 2019 | 0.0% ±2.3 pts | 0.3% |
| Built 1939 or earlier | 0.0% ±2.3 pts | 0.1% |
| Households with no vehicle | 0.7% ±1.1 pts | 0.3% |
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 3551.13 get to work?
51.3% of Census Tract 3551.13's workers drive alone and 33.8% work from home. The average trip to work takes 38.6 minutes.
| Measure | Tract 3551.13 | Blackhawk |
|---|---|---|
| In the labor force (age 16+) | 61.8% ±4.8 pts | 56.3% |
| Unemployment rate | 3.0% ±2.6 pts | 3.0% |
| Drove alone to work | 51.3% ±7.2 pts | 45.3% |
| Carpooled | 5.1% ±3.3 pts | 5.3% |
| Public transportation | 4.4% ±2.9 pts | 4.5% |
| Walked | 4.0% ±4.1 pts | 6.3% |
| Worked from home | 33.8% ±6.3 pts | 37.7% |
| Mean travel time to work | 38.6 min ±5.4 | 36.1 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 3551.13 compare with the other tracts in Contra Costa County?
Among Contra Costa County's tracts with a reliable estimate, Census Tract 3551.13 ranks as shown below (1 = highest).
| Measure | In Contra Costa County |
|---|---|
| Population | 88th of 241 |
| Residents per square mile | 176th of 241 |
| Median household income | 1st of 239 |
| Per capita income | 28th of 241 |
| Median home value | 13th of 236 |
| Median gross rent | 1st of 236 |
| Bachelor's degree or higher | 58th of 239 |
| Median age | 87th of 241 |
| Owner-occupied share | 33rd of 240 |
The tracts next to it on Contra Costa County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3452.04 | 1st | $250,000 or more |
| Tract 3461.01 | 1st | $250,000 or more |
| Tract 3461.02 | 1st | $250,000 or more |
| Tract 3462.04 | 1st | $250,000 or more |
| Tract 3462.06 | 1st | $250,000 or more |
| Tract 3470 | 1st | $250,000 or more |
| Tract 3480 | 1st | $250,000 or more |
| Tract 3512 | 1st | $250,000 or more |
| Tract 3521.02 | 1st | $250,000 or more |
| Tract 3530.01 | 1st | $250,000 or more |
| Tract 3530.02 | 1st | $250,000 or more |
| Tract 3540.02 | 1st | $250,000 or more |
| Tract 3551.13 | 1st | $250,000 or more |
| Tract 3551.21 | 1st | $250,000 or more |
| Tract 3551.23 | 1st | $250,000 or more |
| Tract 3551.24 | 1st | $250,000 or more |
| Tract 3551.25 | 1st | $250,000 or more |
| Tract 3551.26 | 1st | $250,000 or more |
| Tract 3553.02 | 1st | $250,000 or more |
| Tract 3920 | 1st | $250,000 or more |
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 3551.13?
2 of the 18 figures for Census Tract 3551.13 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