San Mateo County

County in California, United States of America, North America

San Mateo County is a county in California, United States. The population in San Mateo County was 729,181 in 2022. The median age in San Mateo County was 40 in 2021. The median income in San Mateo County was $55,146 in 2021. The unemployment rate in San Mateo County was 3.3% in 2023. The percentage of people with obesity in San Mateo County was 21% in 2021. The percentage of people who binge drink in San Mateo County was 15.3% in 2021. The percentage of people who smoke in San Mateo County was 8.1% in 2021.