Marion is located in Linn county Iowa with a geographic area of 17.8 square miles. The total population in Marion is 39,910 with 47.4% male and 52.6% female. Children under age 5 represent 7.4% of the population, under age 18 equal 24.8% of the population and over age 65 is 16.0% of the population. The median household income is $72,500, per capita income is $37,077. There are a total of 15,656 housing units with 77.1% owner occupied. Education includes 22.8% of residents that are high school graduates and 36.7% with a bachelor's degree or higher. The average temperature in Marion in the summer is 73 degrees, and in the winter 23 degrees.
