Henniker is located in Merrimack county New hampshire with a geographic area of 1.4 square miles. The total population in Henniker is 2,566 with 52.8% male and 47.2% female. Children under age 5 represent 5.9% of the population, under age 18 equal 13.3% of the population and over age 65 is 22.2% of the population. The median household income is $96,433, per capita income is $33,161. There are a total of 879 housing units with 62.2% owner occupied. Education includes 11.1% of residents that are high school graduates and 34.1% with a bachelor's degree or higher. The average temperature in Henniker in the summer is 68 degrees, and in the winter 23 degrees.
