Eureka is located in Mcpherson county South dakota with a geographic area of 0.9 square miles. The total population in Eureka is 992 with 41.5% male and 58.5% female. Children under age 5 represent 3.5% of the population, under age 18 equal 17.0% of the population and over age 65 is 38.7% of the population. The median household income is $30,250, per capita income is $25,680. There are a total of 472 housing units with 73.7% owner occupied. Education includes 36.9% of residents that are high school graduates and 20.6% with a bachelor's degree or higher. The average temperature in Eureka in the summer is 69 degrees, and in the winter 15 degrees.
