Plympton is located in Plymouth county Massachusetts with a geographic area of square miles. The total population in Plympton is 2,979 with 47.6% male and 52.4% female. Children under age 5 represent 5.9% of the population, under age 18 equal 22.0% of the population and over age 65 is 20.0% of the population. The median household income is $107,734, per capita income is $44,861. There are a total of 993 housing units with 90.2% owner occupied. Education includes 37.0% of residents that are high school graduates and 35.8% with a bachelor's degree or higher. The average temperature in Plympton in the summer is 70 degrees, and in the winter 30 degrees.