[1] When the district was first established, it covered part of the western suburbs of Cook County and a small portion of Chicago.
The small portion of Chicago in the district contained O'Hare International Airport.
[3] New boundaries were adopted in August 2001, with redistricting taking place following the 2000 United States Census.
[6][7] In regards to townships and equivalent jurisdictions, it included portions of the city of Chicago, as well as portions of Berwyn, Cicero, Leyden, Lyons, Proviso, Riverside, Stickney townships.
[9] The district as redistricted in 2022, following the 2020 United States Census, contains portions of Berwyn, Cicero, Leyden, Lyons, Riverside, and Stickney Townships.