Franklin is located in Sussex county New jersey with a geographic area of 4.4 square miles. The total population in Franklin is 4,737 with 50.6% male and 49.4% female. Children under age 5 represent 4.6% of the population, under age 18 equal 18.3% of the population and over age 65 is 25.1% of the population. The median household income is $77,672, per capita income is $40,797. There are a total of 2,243 housing units with 60.8% owner occupied. Education includes 31.1% of residents that are high school graduates and 19.0% with a bachelor's degree or higher. The average temperature in Franklin in the summer is 73 degrees, and in the winter 34 degrees.