San Mateo County's estimated 2026 population is 746,509 with a growth rate of 0.4% in the past year according to the most recent United States census data. San Mateo County is the 15th largest county in California. The 2010 population was 719,948 and has seen a growth of 3.69% since that time.
Data after 2023 is projected based on recent change
Overall: 40.9 years
Female: 42.2 years
Male: 39.6 years
There are 597,245 adults, (132,242 of whom are seniors) in San Mateo County.
Female: 372,465 (50.2%)
Male: 369,875 (49.8%)
The racial composition of San Mateo County includes 37.84% White, 31.38% Asian, 11.94% other race, and smaller percentages for Black or African American, Native Hawaiian or Pacific Islander, Native American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 280,904 | 37.84% |
| Asian | 232,971 | 31.38% |
| Two or more races | 107,200 | 14.44% |
| Other race | 88,602 | 11.94% |
| Black or African American | 15,785 | 2.13% |
| Native Hawaiian or Pacific Islander | 8,444 | 1.14% |
| Native American | 8,434 | 1.14% |
San Mateo County's average per capita income is $83,175. Household income levels show a median of $158,855. The poverty rate stands at 6.71%.
Name | Median | Mean |
|---|---|---|
| Married Families | $218,404 | $301,038 |
| Families | $189,508 | $267,578 |
| Households | $158,855 | $231,822 |
| Non Families | $98,495 | $144,014 |
Average Income
Median Household Income
Poverty Rate