Northbrook is a village located at the northern edge of Cook County, Illinois. The population was 33,435 at the 2000 census, and estimated to be 34,190 as of 2005.
When incorporated in 1901, the village was known as Shermerville in honor of Frederick Schermer, who donated the land for its first train station. The village changed its name in 1923 as an effort to improve its public image.
Glenbrook North High School, founded in 1953 as Glenbrook High School, is located in Northbrook, as are the corporate headquarters of Underwriters Laboratories, Allstate Corporation, and Crate and Barrel. The village is also home to Northbrook Court shopping mall, the Ed Rudolph Velodrome, and the Northbrook Public Library.
According to the United States Census Bureau, the village has a total area of 13.0 square miles (33.6 km²), of which, 12.9 square miles (33.5 km²) of it is land and 0.1 square miles (0.1 km²) of it (0.39%) is water.
As of the census of 2000, there were 33,435 people, 12,203 households, and 9,676 families residing in the village. The population density was 2,588.1 people per square mile (999.2/km²). There were 12,492 housing units at an average density of 967.0/sq mi (373.3/km²). The racial makeup of the village was 90.22% White, 0.57% African American, 0.04% Native American, 8.85% Asian, 0.01% Pacific Islander, 0.36% from other races, and 0.96% from two or more races. Hispanic or Latino of any race were 0.84% of the population.
There were 12,203 households out of which 35.4% had children under the age of 18 living with them, 72.3% were married couples living together, 5.3% had a female householder with no husband present, and 20.7% were non-families. 18.9% of all households were made up of individuals and 11.3% had someone living alone who was 65 years of age or older. The average household size was 2.68 and the average family size was 3.07.
In the village the population was spread out with 25.5% under the age of 18, 4.4% from 18 to 24, 21.8% from 25 to 44, 29.7% from 45 to 64, and 18.7% who were 65 years of age or older. The median age was 44 years. For every 100 females there were 93.4 males. For every 100 females age 18 and over, there were 88.0 males.
The median income for a household in the village was $95,665, and the median income for a family was $110,778. Males had a median income of $83,206 versus $46,182 for females. The per capita income for the village was $50,765. About 1.2% of families and 2.3% of the population were below the poverty line, including 1.4% of those under age 18 and 4.2% of those age 65 or over.
The school districts located in Northbrook are: