Seymour is located in New haven county Connecticut with a geographic area of square miles. The total population in Seymour is 16,469 with 47.1% male and 52.9% female. Children under age 5 represent 3.0% of the population, under age 18 equal 22.4% of the population and over age 65 is 15.9% of the population. The median household income is $80,396, per capita income is $40,038. There are a total of 6,297 housing units with 72.7% owner occupied. Education includes 30.4% of residents that are high school graduates and 32.5% with a bachelor's degree or higher. The average temperature in Seymour in the summer is 68 degrees, and in the winter 27 degrees.