Northfield is located in Washington county Vermont with a geographic area of 2.2 square miles. The total population in Northfield is 4,413 with 59.8% male and 40.2% female. Children under age 5 represent 4.4% of the population, under age 18 equal 13.4% of the population and over age 65 is 12.3% of the population. The median household income is $53,715, per capita income is $19,488. There are a total of 1,125 housing units with 46.0% owner occupied. Education includes 39.4% of residents that are high school graduates and 30.7% with a bachelor's degree or higher. The average temperature in Northfield in the summer is 65 degrees, and in the winter 19 degrees.