Mercer is located in Somerset county Maine with a geographic area of square miles. The total population in Mercer is 796 with 42.2% male and 57.8% female. Children under age 5 represent 5.2% of the population, under age 18 equal 18.0% of the population and over age 65 is 29.5% of the population. The median household income is $58,462, per capita income is $26,016. There are a total of 346 housing units with 92.5% owner occupied. Education includes 32.4% of residents that are high school graduates and 20.5% with a bachelor's degree or higher. The average temperature in Mercer in the summer is 68 degrees, and in the winter 25 degrees.
