Andover township is located in Sussex county New jersey with a geographic area of 1.3 square miles. The total population in Andover township is 5,914 with 47.9% male and 52.1% female. Children under age 5 represent 4.2% of the population, under age 18 equal 18.0% of the population and over age 65 is 23.4% of the population. The median household income is $113,947, per capita income is $63,636. There are a total of 2,076 housing units with 91.4% owner occupied. Education includes 21.0% of residents that are high school graduates and 47.6% with a bachelor's degree or higher. The average temperature in Andover township in the summer is 73 degrees, and in the winter 34 degrees.