Eastham is located in Barnstable county Massachusetts with a geographic area of square miles. The total population in Eastham is 4,896 with 44.1% male and 55.9% female. Children under age 5 represent 2.1% of the population, under age 18 equal 10.5% of the population and over age 65 is 42.9% of the population. The median household income is $67,127, per capita income is $43,649. There are a total of 2,454 housing units with 91.0% owner occupied. Education includes 18.5% of residents that are high school graduates and 52.9% with a bachelor's degree or higher. The average temperature in Eastham in the summer is 70 degrees, and in the winter 30 degrees.