This page summarizes earthquakes in Pierce County (United States). The most recently recorded event was a magnitude M0.3 earthquake near Pierce County on 2026-08-03 13:04:12 UTC. All event lists and map markers are limited to the last 30 days.
Pierce County is a county in the U.S. state of Washington. As of the 2020 census, the population was 921,130, and was estimated to be 946,288 in 2025, making it the second-most populous county in Washington, behind King County, and the 60th-most populous in the United States.
In 2026, Pierce County recorded 38 earthquakes within United States. The average magnitude was M1.07. The strongest event reached M2.8.
By event count in 2026, this region ranks #68 within United States.
Located on the North America Plate.
