Total Population in Contra Costa County, CA
ACS 2024 5-Year Estimates
How Contra Costa County Compares
National Distribution
Where Contra Costa County falls among all 3,222 U.S. counties for total population.
■ Contra Costa County: 1,165,012
Ranking Context
| Rank | County | Value |
|---|---|---|
| #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 |
Total Population in Contra Costa County, California
Contra Costa County, California has a total population of 1,165,012, which ranks #39 of 3,222 out of 3,222 counties nationwide. This is 99.6% below the national value of 330M.
Within California, Contra Costa County ranks #9 of 58 out of 58 counties. This places it in the 99th percentile nationally.
Total population count from the American Community Survey. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.
About this data
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.