Eureka is a city located in Humboldt County, California. With a 2020 population of 26,938, it is the 264th largest city in California and the 1424th largest city in the United States. Eureka is currently declining at a rate of -0.11% annually and its population has decreased by -0.93% 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 2,871 people per square mile.
The average household income in Eureka is $58,736 with a poverty rate of 22.28%. The median rental costs in recent years comes to $879 per month, and the median house value is $270,600. The median age in Eureka is 38.1 years, 36.8 years for males, and 40.6 years for females. For every 100 females there are 101.5 males.