Stonington is located in New london county Connecticut with a geographic area of 0.3 square miles. The total population in Stonington is 18,539 with 48.9% male and 51.1% female. Children under age 5 represent 3.9% of the population, under age 18 equal 16.3% of the population and over age 65 is 26.1% of the population. The median household income is $93,349, per capita income is $58,872. There are a total of 8,583 housing units with 73.1% owner occupied. Education includes 19.3% of residents that are high school graduates and 51.6% with a bachelor's degree or higher. The average temperature in Stonington in the summer is 68 degrees, and in the winter 27 degrees.
