Nantucket is located in Nantucket county Massachusetts with a geographic area of 5.8 square miles. The total population in Nantucket is 8,606 with 54.8% male and 45.2% female. Children under age 5 represent 4.8% of the population, under age 18 equal 14.3% of the population and over age 65 is 15.2% of the population. The median household income is $107,868, per capita income is $49,918. There are a total of 2,665 housing units with 66.5% owner occupied. Education includes 19.1% of residents that are high school graduates and 56.1% with a bachelor's degree or higher. The average temperature in Nantucket in the summer is 70 degrees, and in the winter 30 degrees.