| Name | San Mateo County |
| State | California |
| FIPS Code | 06081 |
| County Seat | Redwood City |
| Timezone | Pacific Daylight Time (PDT) |
| Population (2024) | 734,267 |
| Population Growth Rate(2020-2024) | -4.14% |
| Majority Ethnicity | White 40.37% |
| Public School Majority Ethnicity | Hispanic 38% |
| Partisan Voting Index | Strongly Democratic:+26 |
| Unemployment Rate (May 2026) | 3.7% |
| Sales Tax Rate (2025) | 9.38% |
| Area Code(s) | 650 / 415 / 628 / 831 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 40.37% |
| African American | 2.2% |
| Hispanic | 24.68% |
| Asian | 30.55% |
| Native American | 1.06% |
| Hawaiin/Pacific Islander | 1.13% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 24.5% |
| African American | 1% |
| Hispanic | 37.81% |
| Asian | 25.81% |
| Native American | 0.16% |
| Hawaiin/Pacific Islander | 1.39% |