Merrimack is located in Hillsborough county New hampshire with a geographic area of square miles. The total population in Merrimack is 26,353 with 49.3% male and 50.7% female. Children under age 5 represent 5.4% of the population, under age 18 equal 22.8% of the population and over age 65 is 15.4% of the population. The median household income is $108,422, per capita income is $47,040. There are a total of 9,995 housing units with 86.9% owner occupied. Education includes 18.0% of residents that are high school graduates and 48.8% with a bachelor's degree or higher. The average temperature in Merrimack in the summer is 68 degrees, and in the winter 23 degrees.
