Total Population in San Mateo County, CA
ACS 2024 5-Year Estimates
How San Mateo County Compares
National Distribution
Where San Mateo County falls among all 3,222 U.S. counties for total population.
■ San Mateo County: 742,340
Ranking Context
| Rank | County | Value |
|---|---|---|
| #86 | DeKalb County, GA | 765,351 |
| #87 | Monroe County, NY | 753,753 |
| #88 | El Paso County, CO | 742,999 |
| #89 | San Mateo County, CA | 742,340 |
| #90 | Norfolk County, MA | 730,082 |
| #91 | Jackson County, MO | 719,976 |
| #92 | Denver County, CO | 718,877 |
Total Population in San Mateo County, California
San Mateo County, California has a total population of 742,340, which ranks #89 of 3,222 out of 3,222 counties nationwide. This is 99.8% below the national value of 330M.
Within California, San Mateo County ranks #15 of 58 out of 58 counties. This places it in the 97th 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.