Barnstead is located in Belknap county New hampshire with a geographic area of square miles. The total population in Barnstead is 4,701 with 45.6% male and 54.4% female. Children under age 5 represent 3.3% of the population, under age 18 equal 17.8% of the population and over age 65 is 16.5% of the population. The median household income is $77,308, per capita income is $33,836. There are a total of 1,804 housing units with 87.5% owner occupied. Education includes 29.3% of residents that are high school graduates and 24.3% with a bachelor's degree or higher. The average temperature in Barnstead in the summer is 68 degrees, and in the winter 23 degrees.