Gilmanton is located in Belknap county New hampshire with a geographic area of square miles. The total population in Gilmanton is 3,760 with 49.3% male and 50.7% female. Children under age 5 represent 6.8% of the population, under age 18 equal 23.0% of the population and over age 65 is 17.1% of the population. The median household income is $81,689, per capita income is $35,183. There are a total of 1,441 housing units with 91.3% owner occupied. Education includes 30.0% of residents that are high school graduates and 29.0% with a bachelor's degree or higher. The average temperature in Gilmanton in the summer is 68 degrees, and in the winter 23 degrees.