What is the population of San Mateo County, CA?
San Mateo County in California has a population of 745,100, per Census ACS 5-Year estimates. The median household income is $156,000 and the median age is 40.6.
Context
Counties are the primary administrative subdivisions of states and a stable unit for tracking population. San Mateo County's population reflects everyone within county lines, including residents of incorporated cities and unincorporated areas.
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San Mateo County in California has a population of 745,100, per Census ACS 5-Year estimates. The median household income is $156,000 and the median age is 40.6.