Marlborough is located in Cheshire county New hampshire with a geographic area of 1.7 square miles. The total population in Marlborough is 1,093 with 50.4% male and 49.6% female. Children under age 5 represent 3.7% of the population, under age 18 equal 15.7% of the population and over age 65 is 21.7% of the population. The median household income is $55,875, per capita income is $47,150. There are a total of 510 housing units with 45.7% owner occupied. Education includes 24.7% of residents that are high school graduates and 31.0% with a bachelor's degree or higher. The average temperature in Marlborough in the summer is 68 degrees, and in the winter 23 degrees.