Contra Costa County Flag

Contra Costa County

State:
California
County Seat:
Martinez

Contra Costa County's estimated 2025 population is 1,151,037 with a growth rate of -0.17% in the past year according to the most recent United States census data. Contra Costa County is the 9th largest county in California. The 2010 population was 1,052,516 and has seen a growth of 9.36% since that time.

1,151,037
Total Population
1,605
Population Density (mi²)
9
Population Rank (State)
-2.0K -0.17%
Annual Population Growth

Contra Costa County Population

Contra Costa County Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Contra Costa County includes 43.5% White, 18.51% Asian, 13.67% other race, 8.47% Black or African American, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White505,20243.5%
Asian214,95818.51%
Two or more races168,61814.52%
Other race158,80013.67%
Black or African American98,3468.47%
Native American9,9410.86%
Native Hawaiian or Pacific Islander5,5930.48%

Contra Costa County Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Contra Costa County's average per capita income is $70,249. Household income levels show a median of $125,727. The poverty rate stands at 8.25%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$171,096$221,154
Families$146,002$193,231
Households$125,727$172,107
Non Families$74,035$107,958

$70,249

Average Income

$125,727

Median Household Income

8.25%

Poverty Rate