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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, The Land of Nod, 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.