Dummer is located in Coos county New hampshire with a geographic area of square miles. The total population in Dummer is 295 with 52.9% male and 47.1% female. Children under age 5 represent 3.4% of the population, under age 18 equal 20.3% of the population and over age 65 is 25.1% of the population. The median household income is $56,250, per capita income is $29,488. There are a total of 131 housing units with 93.9% owner occupied. Education includes 37.4% of residents that are high school graduates and 19.1% with a bachelor's degree or higher. The average temperature in Dummer in the summer is 68 degrees, and in the winter 23 degrees.