Windham is located in Cumberland county Maine with a geographic area of square miles. The total population in Windham is 18,463 with 49.7% male and 50.3% female. Children under age 5 represent 6.1% of the population, under age 18 equal 20.7% of the population and over age 65 is 14.3% of the population. The median household income is $82,188, per capita income is $35,937. There are a total of 6,989 housing units with 87.8% owner occupied. Education includes 22.9% of residents that are high school graduates and 40.8% with a bachelor's degree or higher. The average temperature in Windham in the summer is 68 degrees, and in the winter 25 degrees.