The 4th congressional district of Illinois includes part of Cook County, and has been represented by Democrat Jesús "Chuy" García since January 2019.

A three-judge panel of the federal district court adopted the map proposed by Hastert and other Republican members of the Illinois Congressional delegation.

[11] Due to the 2020 redistricting, this district will be primarily based around Chicago's Southwest Side and central Cook County, as well as a portion of eastern DuPage.

The 4th district takes in the Chicago neighborhoods of Brighton Park, West Elsdon, and South Lawndale; most of New City, Pilsen, and Chicago Lawn; the part of Clearing east of S Austin Ave and W Austin Ave; eastern Garfield Ridge; and half of Bridgeport west of S Halsted St. Outside the Chicago city limits, this district takes in the Cook County communities of Brookfield, Burbank, Berwyn, Cicero, Brookfield, Forest View, Lyons, Hinsdale (shared with DuPage County), Melrose Park, Northlake, McCook, Riverside, Stickney, Stone Park, and Summit; most of Berkeley; the portion of Franklin Park south of Franklin Ave; and part of Bellwood, Bridgeview, Burr Ridge, La Grange, La Grange Park, Maywood, North Riverside, Oak Lawn, and River Grove.

The 4th district takes in the municipalities of Hinsdale (shared with Cook County); and part of Clarendon Hills, Elmhurst, and Oak Brook.