San Mateo County's estimated 2025 population is 721,201 with a growth rate of -0.36% 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 0.17% since that time.
Data after 2023 is projected based on recent change
The racial composition of San Mateo County includes 40.69% White, 30.79% Asian, 11.58% 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 | 303,184 | 40.69% |
| Asian | 229,418 | 30.79% |
| Two or more races | 93,192 | 12.51% |
| Other race | 86,274 | 11.58% |
| Black or African American | 16,534 | 2.22% |
| Native Hawaiian or Pacific Islander | 8,510 | 1.14% |
| Native American | 7,988 | 1.07% |
Married
Widowed
Divorced
Separated
Never Married
San Mateo County's average per capita income is $81,157. Household income levels show a median of $156,000. The poverty rate stands at 6.49%.
Name | Median | Mean |
|---|---|---|
| Married Families | $214,252 | $293,910 |
| Families | $184,583 | $260,921 |
| Households | $156,000 | $226,660 |
| Non Families | $96,648 | $141,308 |
Average Income
Median Household Income
Poverty Rate