Knoxville is located in Marion county Iowa with a geographic area of 4.6 square miles. The total population in Knoxville is 7,154 with 46.2% male and 53.8% female. Children under age 5 represent 5.6% of the population, under age 18 equal 20.0% of the population and over age 65 is 21.6% of the population. The median household income is $50,629, per capita income is $29,137. There are a total of 3,325 housing units with 61.3% owner occupied. Education includes 28.8% of residents that are high school graduates and 21.3% with a bachelor's degree or higher. The average temperature in Knoxville in the summer is 73 degrees, and in the winter 23 degrees.
