Harwinton is located in Litchfield county Connecticut with a geographic area of square miles. The total population in Harwinton is 5,428 with 51.6% male and 48.4% female. Children under age 5 represent 2.7% of the population, under age 18 equal 22.4% of the population and over age 65 is 21.6% of the population. The median household income is $110,652, per capita income is $49,370. There are a total of 2,038 housing units with 95.9% owner occupied. Education includes 19.2% of residents that are high school graduates and 45.1% with a bachelor's degree or higher. The average temperature in Harwinton in the summer is 68 degrees, and in the winter 27 degrees.