South Dakota in United States with a geographic area of 77,116.1 square miles. The total population in South Dakota is 879,336 with 50.4% male and 49.6% female. Children under age 5 represent 6.8% of the population, under age 18 equal 24.5% of the population and over age 65 is 16.7% of the population. The median household income is $59,896, per capita income is $31,415. There are a total of 347,878 housing units with 68.0% owner occupied. Education includes 28.4% of residents that are high school graduates and 30.9% with a bachelor's degree or higher. The average temperature in South Dakota in the summer is 70 degrees, and in the winter 20 degrees.