[1] In its initial 1994 iteration, the district encompassed parts of the northwest, west, and southwest suburbs of Cook County.
[2] New boundaries were adopted in August 2001, with redistricting taking place following the 2000 United States Census.
[3] In regards to townships and equivalent jurisdictions, the district's redistricted boundaries included portions of the city of Chicago, as well as portions of Bremen, Elk Grove, Lemont, Leyden, Lyons, Maine, Northfield, Orland, Palos, Proviso, Wheeling, and Worth townships.
[5][6][7] In regards to townships and equivalent jurisdictions, it included portions of the city of Chicago, as well as portions of Bremen, Elk Grove, Lemont, Leyden, Lyons, Orland, Palos, Proviso, Maine, Riverside, and Worth townships.
[11] Nevertheless, it saw a close result in its most recent election, which saw an unprecedentedly strong and well-funded effort by the Cook County Democratic Party to target the district.