Frelinghuysen township is located in Warren county New jersey with a geographic area of square miles. The total population in Frelinghuysen township is 2,085 with 50.9% male and 49.1% female. Children under age 5 represent 4.7% of the population, under age 18 equal 18.8% of the population and over age 65 is 20.0% of the population. The median household income is $106,447, per capita income is $53,714. There are a total of 708 housing units with 88.4% owner occupied. Education includes 18.6% of residents that are high school graduates and 45.2% with a bachelor's degree or higher. The average temperature in Frelinghuysen township in the summer is 73 degrees, and in the winter 34 degrees.
