San Mateo County, CA
San Mateo County Map
The County of San Mateo is located in the State of California. Find directions to San Mateo County, browse local businesses, landmarks, get current traffic estimates, road conditions, and more. According to the 2020 US Census the San Mateo County population is estimated at 758,308 people. The San Mateo County time zone is Pacific Daylight Time which is 8 hours behind Coordinated Universal Time (UTC).