Wilmington is located in Middlesex county Massachusetts with a geographic area of 17.0 square miles. The total population in Wilmington is 23,390 with 50.6% male and 49.4% female. Children under age 5 represent 5.9% of the population, under age 18 equal 22.6% of the population and over age 65 is 14.6% of the population. The median household income is $133,873, per capita income is $51,486. There are a total of 7,882 housing units with 84.3% owner occupied. Education includes 20.4% of residents that are high school graduates and 51.6% with a bachelor's degree or higher. The average temperature in Wilmington in the summer is 70 degrees, and in the winter 30 degrees.