South elgin is located in Kane county Illinois with a geographic area of 7.1 square miles. The total population in South elgin is 23,648 with 51.2% male and 48.8% female. Children under age 5 represent 4.6% of the population, under age 18 equal 25.3% of the population and over age 65 is 10.1% of the population. The median household income is $99,189, per capita income is $41,648. There are a total of 7,859 housing units with 81.7% owner occupied. Education includes 21.8% of residents that are high school graduates and 39.2% with a bachelor's degree or higher. The average temperature in South elgin in the summer is 74 degrees, and in the winter 27 degrees.