Sumner is located in Oxford county Maine with a geographic area of square miles. The total population in Sumner is 1,047 with 53.5% male and 46.5% female. Children under age 5 represent 7.0% of the population, under age 18 equal 22.0% of the population and over age 65 is 18.4% of the population. The median household income is $44,904, per capita income is $23,160. There are a total of 379 housing units with 89.2% owner occupied. Education includes 41.4% of residents that are high school graduates and 15.8% with a bachelor's degree or higher. The average temperature in Sumner in the summer is 68 degrees, and in the winter 25 degrees.