Winchendon is located in Worcester county Massachusetts with a geographic area of 2.3 square miles. The total population in Winchendon is 4,673 with 49.1% male and 50.9% female. Children under age 5 represent 4.0% of the population, under age 18 equal 22.7% of the population and over age 65 is 13.7% of the population. The median household income is $60,908, per capita income is $31,967. There are a total of 1,699 housing units with 55.7% owner occupied. Education includes 44.1% of residents that are high school graduates and 20.2% with a bachelor's degree or higher. The average temperature in Winchendon in the summer is 70 degrees, and in the winter 30 degrees.