Charlestown is located in Clark county Indiana with a geographic area of 11.4 square miles. The total population in Charlestown is 8,290 with 43.5% male and 56.5% female. Children under age 5 represent 5.7% of the population, under age 18 equal 25.1% of the population and over age 65 is 11.4% of the population. The median household income is $53,054, per capita income is $26,241. There are a total of 3,193 housing units with 72.4% owner occupied. Education includes 32.6% of residents that are high school graduates and 22.2% with a bachelor's degree or higher. The average temperature in Charlestown in the summer is 74 degrees, and in the winter 29 degrees.