Fairfield township is located in Butler county Ohio with a geographic area of 20.8 square miles. The total population in Fairfield township is 9,603 with 47.7% male and 52.3% female. Children under age 5 represent 4.8% of the population, under age 18 equal 22.3% of the population and over age 65 is 24.7% of the population. The median household income is $50,325, per capita income is $30,274. There are a total of 4,005 housing units with 71.6% owner occupied. Education includes 35.5% of residents that are high school graduates and 27.6% with a bachelor's degree or higher. The average temperature in Fairfield township in the summer is 73 degrees, and in the winter 32 degrees.
