Northbrook is located in Cook county Illinois with a geographic area of 13.2 square miles. The total population in Northbrook is 33,216 with 47.4% male and 52.6% female. Children under age 5 represent 5.1% of the population, under age 18 equal 20.8% of the population and over age 65 is 25.6% of the population. The median household income is $128,883, per capita income is $72,969. There are a total of 12,749 housing units with 86.8% owner occupied. Education includes 10.0% of residents that are high school graduates and 74.0% with a bachelor's degree or higher. The average temperature in Northbrook in the summer is 74 degrees, and in the winter 27 degrees.
