Millis is located in Norfolk county Massachusetts with a geographic area of square miles. The total population in Millis is 8,288 with 47.5% male and 52.5% female. Children under age 5 represent 4.9% of the population, under age 18 equal 21.4% of the population and over age 65 is 19.6% of the population. The median household income is $114,255, per capita income is $50,185. There are a total of 3,110 housing units with 82.7% owner occupied. Education includes 22.8% of residents that are high school graduates and 48.7% with a bachelor's degree or higher. The average temperature in Millis in the summer is 70 degrees, and in the winter 30 degrees.