Northbrook is a city located in Cook County, Illinois. With a 2020 population of 32,793, it is the 57th largest city in Illinois and the 1194th largest city in the United States. Northbrook is currently declining at a rate of -0.57% annually and its population has decreased by -1.14% since the most recent census, which recorded a population of 33,170 in 2010. Northbrook reached it's highest population of 33,732 in 2014. Spanning over 13 miles, Northbrook has a population density of 2,477 people per square mile.
The average household income in Northbrook is $171,908 with a poverty rate of 3.01%. The median rental costs in recent years comes to $2,046 per month, and the median house value is $530,900. The median age in Northbrook is 50 years, 49.7 years for males, and 50.2 years for females. For every 100 females there are 87.8 males.