| Name | Contra Costa County |
| State | California |
| FIPS Code | 06013 |
| County Seat | Martinez |
| Timezone | Pacific Daylight Time (PDT) |
| Population (2024) | 1,162,179 |
| Population Growth Rate(2020-2024) | -0.33% |
| Majority Ethnicity | White 43.9% |
| Public School Majority Ethnicity | Hispanic 38% |
| Partisan Voting Index | Democratic:+20 |
| Unemployment Rate (May 2026) | 4.6% |
| Sales Tax Rate (2025) | 8.75% |
| Area Code(s) | 925 / 341 / 510 / 209 / 350 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 43.9% |
| African American | 8.55% |
| Hispanic | 27.53% |
| Asian | 18.68% |
| Native American | 0.86% |
| Hawaiin/Pacific Islander | 0.49% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 24.49% |
| African American | 8.09% |
| Hispanic | 38.27% |
| Asian | 18.49% |
| Native American | 0.29% |
| Hawaiin/Pacific Islander | 0.6% |