When the district was first established, it represented parts of the southern suburbs of Cook County.
[2] New boundaries were adopted in August 2001, with redistricting taking place following the 2000 United States Census.
[4][5][6][7] The district included parts of Alsip, Bedford Park, Blue Island, Bridgeview, Chicago Heights, Chicago Ridge, Country Club Hills, Crestwood, Dolton, Flossmoor, Ford Heights, Frankford, Glenwood, Homewood, Justice, Lansing, Lynwood, Matteson, Midlothian, Oak Forest, Oak Lawn, Orland Park, Orland Hills, Palos Heights, Palos Hills, Park Forest, Richton Park, Robbins, Sauk Village, South Chicago Heights, South Holland, Steger, Thornton, Tinley Park, and Worth.
[6][7] In regards to townships and equivalent jurisdictions, it included portions of the Bloom, Bremen, Lyons, Orland, Palos, Rich, Thornton, and Worth townships.
[9] The district, as redistricted in 2022 following the 2020 United States Census includes portions of the Bloom, Bremen, Lyons, Orland, Palos, Rich, Thornton, and Worth townships.