Total Population in Contra Costa County, CA
ACS 2024 5-Year Estimates
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How Contra Costa County's total population of 1,165,012 compares to all 3,222 U.S. counties. Values range from 33 to 9,808,667.
Distribution of Total Population Across All Counties
Ranking Context
Counties ranked closest to Contra Costa County for total population.
Nearby Rankings
Full ranking →| #36 | Allegheny County, PA | 1,238,177 |
| #37 | Salt Lake County, UT | 1,196,523 |
| #38 | Wake County, NC | 1,178,653 |
| #39 | Contra Costa County, CA | 1,165,012 |
| #40 | Collin County, TX | 1,163,337 |
| #41 | Mecklenburg County, NC | 1,154,681 |
| #42 | Fairfax County, VA | 1,147,837 |
About Total Population
Contra Costa County, California has a total population of 1,165,012, ranking #39 of 3,222 counties nationwide — 99.6% below the national value of 330M. Within California, it ranks #9 of 58. This places it in the 99th percentile nationally.
Total population count from the American Community Survey. Source: U.S. Census Bureau, American Community Survey 2024 5-Year Estimates. All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.