Williamstown is located in Gloucester county New jersey with a geographic area of 7.4 square miles. The total population in Williamstown is 14,161 with 45.4% male and 54.6% female. Children under age 5 represent 2.9% of the population, under age 18 equal 20.6% of the population and over age 65 is 18.8% of the population. The median household income is $83,945, per capita income is $39,162. There are a total of 5,703 housing units with 85.1% owner occupied. Education includes 34.7% of residents that are high school graduates and 30.1% with a bachelor's degree or higher. The average temperature in Williamstown in the summer is 73 degrees, and in the winter 34 degrees.
