Derby is located in Orleans county Vermont with a geographic area of square miles. The total population in Derby is 4,256 with 46.2% male and 53.8% female. Children under age 5 represent 7.0% of the population, under age 18 equal 22.3% of the population and over age 65 is 22.2% of the population. The median household income is $59,406, per capita income is $30,829. There are a total of 1,825 housing units with 76.2% owner occupied. Education includes 33.2% of residents that are high school graduates and 32.3% with a bachelor's degree or higher. The average temperature in Derby in the summer is 65 degrees, and in the winter 19 degrees.