Chillicothe is located in Ross county Ohio with a geographic area of 10.5 square miles. The total population in Chillicothe is 21,668 with 47.2% male and 52.8% female. Children under age 5 represent 7.0% of the population, under age 18 equal 21.1% of the population and over age 65 is 20.6% of the population. The median household income is $45,251, per capita income is $29,467. There are a total of 9,269 housing units with 58.8% owner occupied. Education includes 38.0% of residents that are high school graduates and 23.7% with a bachelor's degree or higher. The average temperature in Chillicothe in the summer is 72 degrees, and in the winter 32 degrees.