In 2019, San Mateo County, CA had a population of 767k people with a median age of 39.9 and a median household income of $138,500. Between 2018 and 2019 the population of San Mateo County, CA declined from 769,545 to 766,573, a −0.386% decrease and its median household income grew from $124,425 to $138,500, a 11.3% increase.
The 5 largest ethnic groups in San Mateo County, CA are White (Non-Hispanic) (38.4%), Asian (Non-Hispanic) (29.7%), White (Hispanic) (11.3%), Other (Hispanic) (10.5%), and Two+ (Non-Hispanic) (3.81%). 44.5% of the households in San Mateo County, CA speak a non-English language at home as their primary language.
84.7% of the residents in San Mateo County, CA are U.S. citizens.
In 2019, the median property value in San Mateo County, CA was $1.23M, and the homeownership rate was 59.3%. 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.