Mount arlington is located in Morris county New jersey with a geographic area of 2.1 square miles. The total population in Mount arlington is 5,751 with 42.8% male and 57.2% female. Children under age 5 represent 6.7% of the population, under age 18 equal 20.2% of the population and over age 65 is 19.1% of the population. The median household income is $95,086, per capita income is $46,726. There are a total of 2,362 housing units with 67.9% owner occupied. Education includes 22.6% of residents that are high school graduates and 37.6% with a bachelor's degree or higher. The average temperature in Mount arlington in the summer is 73 degrees, and in the winter 34 degrees.