Cooper is located in Washington county Maine with a geographic area of square miles. The total population in Cooper is 141 with 51.1% male and 48.9% female. Children under age 5 represent 0.7% of the population, under age 18 equal 9.9% of the population and over age 65 is 33.3% of the population. The median household income is $48,333, per capita income is $37,218. There are a total of 74 housing units with 85.1% owner occupied. Education includes 32.4% of residents that are high school graduates and 17.6% with a bachelor's degree or higher. The average temperature in Cooper in the summer is 68 degrees, and in the winter 25 degrees.