Northbrook is a city located in Illinois. With a 2020 population of 32,806, it is the 57th largest city in Illinois and the 1188th largest city in the United States. Northbrook is currently declining at a rate of -0.46% annually and its population has decreased by -1.10% since the most recent census, which recorded a population of 33,170 in 2010. Northbrook reached it's highest population of 33,711 in 2014. Spanning over 13 miles, Northbrook has a population density of 2,478 people per square mile.
The average household income in Northbrook is $174,808 with a poverty rate of 3.28%. The median rental costs in recent years comes to $2,056 per month, and the median house value is $534,800. The median age in Northbrook is 50.2 years, 50.3 years for males, and 50.1 years for females. For every 100 females there are 86.7 males.