Iowa in United States with a geographic area of 56,271.2 square miles. The total population in Iowa is 3,150,011 with 49.7% male and 50.3% female. Children under age 5 represent 6.2% of the population, under age 18 equal 23.1% of the population and over age 65 is 17.1% of the population. The median household income is $61,836, per capita income is $33,021. There are a total of 1,273,941 housing units with 71.2% owner occupied. Education includes 28.5% of residents that are high school graduates and 30.5% with a bachelor's degree or higher. The average temperature in Iowa in the summer is 72 degrees, and in the winter 21 degrees.