Census tract · Contra Costa County
Census Tract 3040.06, Contra Costa County, California
Census Tract 3040.06, GEOID 06013304006, in Contra Costa County, California, mostly within Discovery Bay (55% of its census blocks). 3,843 residents in the ACS 2020-2024 5-year estimates (±385); the 2020 Census counted 3,987.
Residents, 2020-2024
3,843
±385 (90% margin)
2020 Census count: 3,987
Median household income
$167,208
±$20,549 (90% margin)
Contra Costa County: $127,229
Median home value
$793,100
±$49,138 (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 3040.06?
Census Tract 3040.06 is one of 242 census tracts in Contra Costa County, California. It covers 14.87 square miles of land, 268 residents per square mile in 2020. Its GEOID, 06013304006, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Discovery Bay | 55% |
| Knightsen | 7% |
7 census tracts border Census Tract 3040.06: Tract 3010 ($85,198), Tract 3020.11 ($143,629), Tract 3031.06 ($119,806), Tract 3040.03 ($126,050), Tract 3040.04 ($137,232), Tract 3040.07 ($158,556) and Tract 39 in San Joaquin County ($41,731). 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 3040.06?
The 2020-2024 American Community Survey puts Census Tract 3040.06's population at 3,843 (±385) in 1,113 households; the 2020 Census counted 3,987 residents and 1,299 housing units.
| Measure | Tract 3040.06 | Discovery Bay |
|---|---|---|
| Total population | 3,843±385 | 14,911 |
| Households | 1,113±101 | 5,421 |
| Average household size | 3.41±0.32 | 2.74 |
| Housing units | 1,166±94 | 6,053 |
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 3040.06?
The median resident of Census Tract 3040.06 is 37.1 years old; 28.5% are under 18 and 11.7% are 65 or older. The largest group is non-Hispanic white residents at 43.9%, then Hispanic or Latino residents (of any race) at 21.9%. 10.1% of residents were born outside the United States.
| Measure | Tract 3040.06 | Discovery Bay |
|---|---|---|
| Median age | 37.1±4.4 | 45.6 |
| Under 18 years | 28.5%±3.4 pts | 22.5% |
| 65 years and over | 11.7%±2.8 pts | 19.1% |
| Hispanic or Latino (any race) | 21.9%±6.5 pts | 19.2% |
| White alone, not Hispanic | 43.9%±10.2 pts | 55.6% |
| Black or African American alone, not Hispanic | 10.7%±8.9 pts | 8.2% |
| Asian alone, not Hispanic | 15.2%±10.0 pts | 7.0% |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±1.1 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.1 pts | 0.5% |
| Two or more races, not Hispanic | 8.3%±4.3 pts | 7.2% |
| Some other race alone, not Hispanic | 0.0%±1.1 pts | 2.3% |
| Born outside the United States | 10.1%±4.3 pts | 12.2% |
| Speak a language other than English at home (age 5+) | 17.0%±7.7 pts | 13.6% |
| Civilian veterans (age 18+) | 4.9%±3.5 pts | 6.0% |
| With a disability | 12.4%±4.1 pts | 11.7% |
| No health insurance coverage | 3.6%±2.2 pts | 5.8% |
| High school graduate or higher (age 25+) | 96.2%±2.6 pts | 94.4% |
| Bachelor's degree or higher (age 25+) | 38.7%±8.3 pts | 32.7% |
| Graduate or professional degree (age 25+) | 18.3%±5.1 pts | 11.9% |
| Lived in the same house a year earlier | 83.8%±7.8 pts | 91.5% |
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 3040.06 earn?
Half of the 1,113 households in Census Tract 3040.06 earn less than $167,208 a year (±$20,549), against $127,229 across Contra Costa County: 63rd highest of the county's 239 tracts with a reliable estimate.
| Measure | Tract 3040.06 | Discovery Bay |
|---|---|---|
| Median household income | $167,208±$20,549 | $147,117 |
| Mean household income | $198,602±$23,870 | $174,068 |
| Per capita income | $59,234±$8,714 | $64,204 |
| People below the poverty line | 3.9%±2.8 pts | 7.4% |
| Children under 18 below the poverty line | 0.0%±3.9 pts | 11.9% |
| Households receiving SNAP | 9.2%±6.9 pts | 7.2% |
| Households with a computer | 97.5%±3.6 pts | 98.2% |
| Households with a broadband subscription | 93.8%±6.7 pts | 98.1% |
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 3040.06?
Owners occupy 88.7% of Census Tract 3040.06's occupied homes and renters 11.3%. The median owner-occupied home is valued at $793,100 by its owner (±$49,138). The median renter pays $3,500 or more a month including utilities.
| Measure | Tract 3040.06 | Discovery Bay |
|---|---|---|
| Median home value (owner-occupied) | $793,100±$49,138 | $832,000 |
| Median gross rent | $3,500 or more | $3,029 |
| Renters paying 35% or more of income on rent | 46.8%±45.5 pts | 73.1% |
| Median monthly owner costs, with a mortgage | $3,564±$284 | $3,529 |
| Owner-occupied homes | 88.7%±7.6 pts | 90.1% |
| Renter-occupied homes | 11.3%±7.6 pts | 9.9% |
| Housing units | 1,166±94 | 6,053 |
| Single-family detached homes | 92.2%±4.4 pts | 90.8% |
| Mobile homes | 1.5%±1.6 pts | 0.0% |
| Built 2020 or later | 2.3%±2.6 pts | 1.1% |
| Built 2010 to 2019 | 43.3%±9.0 pts | 8.5% |
| Built 1939 or earlier | 1.8%±2.7 pts | 1.2% |
| Households with no vehicle | 2.5%±3.6 pts | 2.3% |
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 3040.06 get to work?
70.1% of Census Tract 3040.06's workers drive alone and 22.0% work from home. The average trip to work takes 39.8 minutes. The unemployment rate in 2020-2024 averaged 9.4%.
| Measure | Tract 3040.06 | Discovery Bay |
|---|---|---|
| In the labor force (age 16+) | 70.0%±5.0 pts | 60.2% |
| Unemployment rate | 9.4%±3.6 pts | 8.6% |
| Drove alone to work | 70.1%±8.1 pts | 66.2% |
| Carpooled | 4.2%±3.3 pts | 9.2% |
| Public transportation | 0.8%±1.5 pts | 0.2% |
| Walked | 1.9%±2.1 pts | 0.5% |
| Worked from home | 22.0%±7.5 pts | 22.3% |
| Mean travel time to work | 39.8 min±5.9 | 44.1 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 3040.06 compare with the other tracts in Contra Costa County?
Among Contra Costa County's tracts with a reliable estimate, Census Tract 3040.06 ranks as shown below (1 = highest).
| Measure | In Contra Costa County | In Discovery Bay |
|---|---|---|
| Population | 164th of 241 | 2nd of 4 |
| Residents per square mile | 234th of 241 | 4th of 4 |
| Median household income | 63rd of 239 | 1st of 4 |
| Per capita income | 114th of 241 | 3rd of 4 |
| Median home value | 119th of 236 | 2nd of 4 |
| Median gross rent | 1st of 236 | 1st of 4 |
| Bachelor's degree or higher | 136th of 239 | 2nd of 4 |
| Median age | 179th of 241 | 4th of 4 |
| Owner-occupied share | 44th of 240 | 3rd of 4 |
The tracts next to it on Contra Costa County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 3923 | 60th | $172,000±$67,973 · within the margin of this tract |
| Tract 3200.03 | 61st | $171,343±$14,731 · within the margin of this tract |
| Tract 3400.04 | 62nd | $171,218±$54,150 · within the margin of this tract |
| Tract 3040.06 | 63rd | $167,208±$20,549 |
| Tract 3340.06 | 64th | $167,167±$14,808 · within the margin of this tract |
| Tract 3551.19 | 65th | $166,528±$49,061 · within the margin of this tract |
| Tract 3031.05 | 66th | $165,625±$47,365 · 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 3040.06?
2 of the 18 figures for Census Tract 3040.06 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