Somerville is located in Lincoln county Maine with a geographic area of square miles. The total population in Somerville is 717 with 54.1% male and 45.9% female. Children under age 5 represent 1.5% of the population, under age 18 equal 32.6% of the population and over age 65 is 12.7% of the population. The median household income is $54,688, per capita income is $19,232. There are a total of 217 housing units with 88.9% owner occupied. Education includes 28.1% of residents that are high school graduates and 34.6% with a bachelor's degree or higher. The average temperature in Somerville in the summer is 68 degrees, and in the winter 25 degrees.