Deep river is located in Middlesex county Connecticut with a geographic area of square miles. The total population in Deep river is 4,466 with 48.8% male and 51.2% female. Children under age 5 represent 3.9% of the population, under age 18 equal 20.2% of the population and over age 65 is 20.2% of the population. The median household income is $80,495, per capita income is $47,196. There are a total of 1,987 housing units with 69.9% owner occupied. Education includes 21.0% of residents that are high school graduates and 49.8% with a bachelor's degree or higher. The average temperature in Deep river in the summer is 68 degrees, and in the winter 27 degrees.