Martinsville is located in Morgan county Indiana with a geographic area of 9.2 square miles. The total population in Martinsville is 11,807 with 50.1% male and 49.9% female. Children under age 5 represent 5.6% of the population, under age 18 equal 22.4% of the population and over age 65 is 14.7% of the population. The median household income is $50,264, per capita income is $24,565. There are a total of 4,486 housing units with 60.7% owner occupied. Education includes 44.4% of residents that are high school graduates and 10.2% with a bachelor's degree or higher. The average temperature in Martinsville in the summer is 72 degrees, and in the winter 29 degrees.