Eureka is a city situated on the North Coast of California and serves as the county seat of Humboldt County. It is located along U.S. Route 101 on the shores of Humboldt Bay, positioned approximately 270 miles north of San Francisco and 100 miles south of the Oregon border.
As of the 2020 census, the city had a population of 26,512, while the broader Eureka area recorded a population of 48,119. The city is defined by its coastal geography and its administrative role within Humboldt County.