Greenwich township is located in Cumberland county New jersey with a geographic area of 0.8 square miles. The total population in Greenwich township is 5,473 with 47.7% male and 52.3% female. Children under age 5 represent 4.3% of the population, under age 18 equal 25.7% of the population and over age 65 is 9.3% of the population. The median household income is $137,152, per capita income is $49,082. There are a total of 1,840 housing units with 88.5% owner occupied. Education includes 11.3% of residents that are high school graduates and 58.5% with a bachelor's degree or higher. The average temperature in Greenwich township in the summer is 73 degrees, and in the winter 34 degrees.