Eureka is a city located in Missouri. With a 2020 population of 10,815, it is the 76th largest city in Missouri and the 2929th largest city in the United States. Eureka is currently growing at a rate of 0.26% annually and its population has increased by 6.14% since the most recent census, which recorded a population of 10,189 in 2010. Spanning over 11 miles, Eureka has a population density of 1,029 people per square mile.
The average household income in Eureka is $123,113 with a poverty rate of 1.62%. The median rental costs in recent years comes to $1,123 per month, and the median house value is $270,600. The median age in Eureka is 39.6 years, 39 years for males, and 40.4 years for females. For every 100 females there are 110.8 males.