Ballwin is located in St. louis county Missouri with a geographic area of 9.0 square miles. The total population in Ballwin is 30,177 with 48.8% male and 51.2% female. Children under age 5 represent 6.1% of the population, under age 18 equal 22.5% of the population and over age 65 is 20.3% of the population. The median household income is $97,174, per capita income is $49,370. There are a total of 11,934 housing units with 85.4% owner occupied. Education includes 11.4% of residents that are high school graduates and 63.5% with a bachelor's degree or higher. The average temperature in Ballwin in the summer is 77 degrees, and in the winter 32 degrees.
