Martinsville is located in Clinton county Ohio with a geographic area of 0.4 square miles. The total population in Martinsville is 747 with 53.7% male and 46.3% female. Children under age 5 represent 3.9% of the population, under age 18 equal 43.4% of the population and over age 65 is 4.8% of the population. The median household income is $60,559, per capita income is $16,685. There are a total of 197 housing units with 65.5% owner occupied. Education includes 51.3% of residents that are high school graduates and 6.6% with a bachelor's degree or higher. The average temperature in Martinsville in the summer is 73 degrees, and in the winter 32 degrees.