Affton is located in St. louis county Missouri with a geographic area of 4.6 square miles. The total population in Affton is 19,580 with 49.7% male and 50.3% female. Children under age 5 represent 4.3% of the population, under age 18 equal 16.7% of the population and over age 65 is 18.7% of the population. The median household income is $68,555, per capita income is $34,706. There are a total of 8,782 housing units with 75.0% owner occupied. Education includes 22.8% of residents that are high school graduates and 31.4% with a bachelor's degree or higher. The average temperature in Affton in the summer is 77 degrees, and in the winter 32 degrees.
