Eureka is a city located in Kansas. With a 2020 population of 2,359, it is the 103rd largest city in Kansas and the 7027th largest city in the United States. Eureka is currently declining at a rate of -0.30% annually and its population has decreased by -10.41% since the most recent census, which recorded a population of 2,633 in 2010. Eureka reached it's highest population of 4,055 in 1960. Spanning over 2 miles, Eureka has a population density of 1,030 people per square mile.
The average household income in Eureka is $46,779 with a poverty rate of 16.70%. The median rental costs in recent years comes to $533 per month, and the median house value is $49,300. The median age in Eureka is 45 years, 40 years for males, and 51.4 years for females. For every 100 females there are 98.1 males.