Acton is located in Middlesex county Massachusetts with a geographic area of square miles. The total population in Acton is 23,634 with 46.8% male and 53.2% female. Children under age 5 represent 4.2% of the population, under age 18 equal 25.6% of the population and over age 65 is 15.3% of the population. The median household income is $137,981, per capita income is $62,558. There are a total of 8,747 housing units with 71.9% owner occupied. Education includes 7.4% of residents that are high school graduates and 78.0% with a bachelor's degree or higher. The average temperature in Acton in the summer is 70 degrees, and in the winter 30 degrees.