Deerfield is located in Rockingham county New hampshire with a geographic area of square miles. The total population in Deerfield is 4,509 with 47.0% male and 53.0% female. Children under age 5 represent 4.7% of the population, under age 18 equal 19.2% of the population and over age 65 is 15.4% of the population. The median household income is $111,003, per capita income is $46,937. There are a total of 1,653 housing units with 85.5% owner occupied. Education includes 20.3% of residents that are high school graduates and 44.0% with a bachelor's degree or higher. The average temperature in Deerfield in the summer is 68 degrees, and in the winter 23 degrees.