Shelbyville is located in Shelby county Indiana with a geographic area of 12.5 square miles. The total population in Shelbyville is 18,918 with 47.8% male and 52.2% female. Children under age 5 represent 7.0% of the population, under age 18 equal 24.3% of the population and over age 65 is 16.1% of the population. The median household income is $49,586, per capita income is $25,394. There are a total of 8,042 housing units with 58.0% owner occupied. Education includes 48.6% of residents that are high school graduates and 15.8% with a bachelor's degree or higher. The average temperature in Shelbyville in the summer is 73 degrees, and in the winter 29 degrees.