Sullivan is located in Cheshire county New hampshire with a geographic area of square miles. The total population in Sullivan is 696 with 46.3% male and 53.7% female. Children under age 5 represent 8.2% of the population, under age 18 equal 21.4% of the population and over age 65 is 14.4% of the population. The median household income is $83,750, per capita income is $36,527. There are a total of 285 housing units with 87.7% owner occupied. Education includes 21.8% of residents that are high school graduates and 31.2% with a bachelor's degree or higher. The average temperature in Sullivan in the summer is 68 degrees, and in the winter 23 degrees.
