Contra Costa County's estimated 2026 population is 1,170,606 with a growth rate of 0.05% 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 11.22% since that time.
Data after 2023 is projected based on recent change
Overall: 40.5 years
Female: 41.5 years
Male: 39.5 years
There are 909,012 adults, (199,270 of whom are seniors) in Contra Costa County.
Female: 592,046 (50.8%)
Male: 572,966 (49.2%)
The racial composition of Contra Costa County includes 41.12% White, 18.85% Asian, 13.93% other race, 8.28% Black or African American, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 479,110 | 41.12% |
| Asian | 219,557 | 18.85% |
| Two or more races | 190,585 | 16.36% |
| Other race | 162,268 | 13.93% |
| Black or African American | 96,408 | 8.28% |
| Native American | 11,438 | 0.98% |
| Native Hawaiian or Pacific Islander | 5,646 | 0.48% |
Contra Costa County's average per capita income is $71,603. Household income levels show a median of $127,229. The poverty rate stands at 8.36%.
Name | Median | Mean |
|---|---|---|
| Married Families | $174,901 | $225,542 |
| Families | $148,679 | $196,934 |
| Households | $127,229 | $174,872 |
| Non Families | $73,983 | $107,910 |
Average Income
Median Household Income
Poverty Rate