Southwick is located in Hampden county Massachusetts with a geographic area of square miles. The total population in Southwick is 9,722 with 49.8% male and 50.2% female. Children under age 5 represent 4.5% of the population, under age 18 equal 17.9% of the population and over age 65 is 22.3% of the population. The median household income is $84,896, per capita income is $41,255. There are a total of 3,869 housing units with 80.7% owner occupied. Education includes 16.2% of residents that are high school graduates and 42.5% with a bachelor's degree or higher. The average temperature in Southwick in the summer is 70 degrees, and in the winter 30 degrees.