Belfast is located in Waldo county Maine with a geographic area of 34.0 square miles. The total population in Belfast is 6,710 with 42.6% male and 57.4% female. Children under age 5 represent 4.3% of the population, under age 18 equal 13.9% of the population and over age 65 is 35.3% of the population. The median household income is $62,720, per capita income is $35,216. There are a total of 3,229 housing units with 66.1% owner occupied. Education includes 21.3% of residents that are high school graduates and 44.8% with a bachelor's degree or higher. The average temperature in Belfast in the summer is 66 degrees, and in the winter 25 degrees.