Total Population in San Mateo County, CA
ACS 2024 5-Year Estimates
742,340
Rank #89/3,222 · #15 in CA
97th
San Mateo 742,340
CA 39M -98.1%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How San Mateo County's total population of 742,340 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 San Mateo County for total population.
Nearby Rankings
Full ranking →| #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 |
About Total Population
San Mateo County, California has a total population of 742,340, ranking #89 of 3,222 counties nationwide — 99.8% below the national value of 330M. Within California, it ranks #15 of 58. This places it in the 97th 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.