Derby is located in New haven county Connecticut with a geographic area of 5.1 square miles. The total population in Derby is 12,420 with 47.4% male and 52.6% female. Children under age 5 represent 3.5% of the population, under age 18 equal 15.1% of the population and over age 65 is 20.0% of the population. The median household income is $58,534, per capita income is $37,266. There are a total of 5,740 housing units with 64.2% owner occupied. Education includes 35.7% of residents that are high school graduates and 20.7% with a bachelor's degree or higher. The average temperature in Derby in the summer is 68 degrees, and in the winter 27 degrees.
