Hillsboro is located in Highland county Ohio with a geographic area of 5.5 square miles. The total population in Hillsboro is 6,535 with 46.1% male and 53.9% female. Children under age 5 represent 6.4% of the population, under age 18 equal 20.8% of the population and over age 65 is 25.5% of the population. The median household income is $37,000, per capita income is $22,173. There are a total of 2,898 housing units with 49.0% owner occupied. Education includes 41.4% of residents that are high school graduates and 19.9% with a bachelor's degree or higher. The average temperature in Hillsboro in the summer is 72 degrees, and in the winter 32 degrees.