Greenville is located in Piscataquis county Maine with a geographic area of 4.1 square miles. The total population in Greenville is 1,203 with 45.9% male and 54.1% female. Children under age 5 represent 0.0% of the population, under age 18 equal 19.6% of the population and over age 65 is 25.8% of the population. The median household income is $40,947, per capita income is $25,881. There are a total of 529 housing units with 74.1% owner occupied. Education includes 40.1% of residents that are high school graduates and 20.0% with a bachelor's degree or higher. The average temperature in Greenville in the summer is 68 degrees, and in the winter 25 degrees.