Somerville is located in Butler county Ohio with a geographic area of 0.3 square miles. The total population in Somerville is 304 with 48.7% male and 51.3% female. Children under age 5 represent 12.2% of the population, under age 18 equal 21.7% of the population and over age 65 is 13.5% of the population. The median household income is $72,375, per capita income is $25,494. There are a total of 97 housing units with 78.4% owner occupied. Education includes 53.6% of residents that are high school graduates and 16.5% with a bachelor's degree or higher. The average temperature in Somerville in the summer is 73 degrees, and in the winter 32 degrees.