This page summarizes earthquakes in San Mateo County (United States). The most recently recorded event was a magnitude M1.3 earthquake near Pacifica on 2026-06-15 07:11:30 UTC. All event lists and map markers are limited to the last 30 days.
San Mateo County, officially the County of San Mateo, is a county located in the U.S. state of California. As of the 2020 United States census, the population was 764,442. Redwood City is the county seat, the third-most populated city in the county after Daly City and San Mateo.
In 2026, San Mateo County recorded 51 earthquakes within United States. The average magnitude was M1.68. The strongest event reached M3.0.
By event count in 2026, this region ranks #46 within United States.
Located on the Pacific Plate.
