Sanbornton is located in Belknap county New hampshire with a geographic area of square miles. The total population in Sanbornton is 2,992 with 51.5% male and 48.5% female. Children under age 5 represent 2.3% of the population, under age 18 equal 17.7% of the population and over age 65 is 20.1% of the population. The median household income is $68,214, per capita income is $36,154. There are a total of 1,146 housing units with 72.8% owner occupied. Education includes 19.5% of residents that are high school graduates and 40.1% with a bachelor's degree or higher. The average temperature in Sanbornton in the summer is 68 degrees, and in the winter 23 degrees.