[1] When the district was first established, it covered parts of the North Side of Chicago and the northern suburbs of Cook County.
[2] New boundaries were adopted in August 2001, with redistricting taking place following the 2000 United States Census.
[5][6] It included the West Ridge and Rogers Park areas of the City of Chicago as well as Evanston, Glencoe, Glenview, Kenilworth, Lincolnwood, Morton Grove, Northbrook, Northfield, Skokie, Wilmette, and Winnetka in the north suburbs.
[10] The district as redistricted in 2022, following the 2020 United States Census, contains the entirety of Evanston, the entirety of Niles and Rogers Park Townships, and small portions of the Lake View and Rogers Park neighborhoods of Chicago.
[11] The district has leaned strongly Democratic in its elections to the Cook County Board of Commissioners.