In 2018, San Mateo County, CA had a population of 770k people with a median age of 39.9 and a median household income of $124,425. Between 2017 and 2018 the population of San Mateo County, CA declined from 771,410 to 769,545, a -0.242% decrease and its median household income grew from $116,653 to $124,425, a 6.66% increase.
The 5 largest ethnic groups in San Mateo County, CA are White (Non-Hispanic) (38.4%), Asian (Non-Hispanic) (29.1%), White (Hispanic) (11.7%), Other (Hispanic) (9.86%), and Two+ (Non-Hispanic) (4.25%). 45.8% of the households in San Mateo County, CA speak a non-English language at home as their primary language, and 85.2% of the residents in San Mateo County, CA are U.S. citizens.
In 2018, the median property value in San Mateo County, CA was $1.21M, and the homeownership rate was 60.5%. Most people in San Mateo County, CA drove alone to work, and the average commute time was 28.1 minutes. The average car ownership in San Mateo County, CA was 2 cars per household.