Holliston is located in Middlesex county Massachusetts with a geographic area of square miles. The total population in Holliston is 14,792 with 49.9% male and 50.1% female. Children under age 5 represent 4.6% of the population, under age 18 equal 25.1% of the population and over age 65 is 15.5% of the population. The median household income is $137,589, per capita income is $65,280. There are a total of 5,452 housing units with 89.9% owner occupied. Education includes 10.2% of residents that are high school graduates and 66.5% with a bachelor's degree or higher. The average temperature in Holliston in the summer is 70 degrees, and in the winter 30 degrees.
