| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IL-01 | Bobby L RushDEM | DEM | 325,123 | 73.8% | D+47.6 |
| IL-02 | DEM | 298,038 | 78.8% | D+57.6 | |
| IL-03 | Marie NewmanDEM | DEM | 306,848 | 56.4% | D+12.8 |
| IL-04 | DEM | 222,737 | 84.0% | D+68.1 | |
| IL-05 | Mike QuigleyDEM | DEM | 361,271 | 70.8% | D+44.1 |
| IL-06 | Sean CastenDEM | DEM | 404,747 | 52.8% | D+7.4 |
| IL-07 | DEM | 310,128 | 80.4% | D+67.1 | |
| IL-08 | DEM | 254,578 | 73.2% | D+73.2 | |
| IL-09 | DEM | 369,170 | 71.0% | D+42.0 | |
| IL-10 | DEM | 316,874 | 63.9% | D+27.8 | |
| IL-11 | Bill FosterDEM | DEM | 307,377 | 63.3% | D+26.6 |
| IL-12 | Mike BostREP | REP | 322,416 | 60.4% | R+20.9 |
| IL-13 | Rodney DavisREP | REP | 333,021 | 54.5% | R+8.9 |
| IL-14 | DEM | 401,052 | 50.7% | D+1.3 | |
| IL-15 | REP | 333,506 | 73.5% | R+46.9 | |
| IL-16 | REP | 338,159 | 64.7% | R+29.4 | |
| IL-17 | Cheri BustosDEM | DEM | 299,895 | 52.0% | D+4.0 |
| IL-18 | Darin LahoodREP | REP | 371,879 | 70.4% | R+40.8 |