Plainville is located in Hartford county Connecticut with a geographic area of square miles. The total population in Plainville is 17,605 with 51.7% male and 48.3% female. Children under age 5 represent 4.5% of the population, under age 18 equal 17.1% of the population and over age 65 is 19.2% of the population. The median household income is $70,012, per capita income is $40,869. There are a total of 8,187 housing units with 67.6% owner occupied. Education includes 30.1% of residents that are high school graduates and 31.6% with a bachelor's degree or higher. The average temperature in Plainville in the summer is 68 degrees, and in the winter 27 degrees.