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All San Mateo County population data above are from the US Census Bureau.
The population data for San Mateo County are from the Census' American Community Survey 2018 5-year estimates and the Census' 2019 Population Estimates. The demographic data for Marin County, San Francisco County, San Joaquin County, and Stanislaus County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2018 5-year estimates, and were downloaded on 19 December 2019. Check out our FAQ section for more details.
With 766,573 people, San Mateo County is the 14th most populated county in the state of California out of 58 counties. But watch out, San Mateo County, because San Joaquin County with 762,148 people and Stanislaus County with 550,660 people are right behind you.
The largest San Mateo County racial/ethnic groups are White (39.6%) followed by Asian (27.7%) and Hispanic (24.7%).
In 2018, the median household income of San Mateo County residents was $113,776. San Mateo County households made slightly more than Marin County households ($110,217) and San Francisco County households ($104,552) . However, 7.0% of San Mateo County residents live in poverty.
The median age for San Mateo County residents is 39.6 years young.
86% of people CANNOT find the data they're looking for on the US Census Bureau website. Source: Nielsen Norman Group
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