Eureka is a city located in Humboldt County California. It is also the county seat of Humboldt County. With a 2020 population of 26,194, it is the 266th largest city in California and the 1476th largest city in the United States . Eureka is currently declining at a rate of -0.98% annually and its population has decreased by -3.67% since the most recent census, which recorded a population of 27,191 in 2010. Eureka reached it's highest population of 28,137 in 1960. Spanning over 14 miles, Eureka has a population density of 2,791 people per square mile.
The average household income in Eureka is $62,953 with a poverty rate of 19.97%. The median rental costs in recent years comes to $916 per month, and the median house value is $281,400. The median age in Eureka is 38 years, 38 years for males, and 38 years for females.