Marion is located in Plymouth county Massachusetts with a geographic area of square miles. The total population in Marion is 5,148 with 48.4% male and 51.6% female. Children under age 5 represent 3.0% of the population, under age 18 equal 21.6% of the population and over age 65 is 25.6% of the population. The median household income is $85,636, per capita income is $53,719. There are a total of 1,946 housing units with 81.2% owner occupied. Education includes 22.9% of residents that are high school graduates and 49.6% with a bachelor's degree or higher. The average temperature in Marion in the summer is 70 degrees, and in the winter 30 degrees.