| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IL-01 | DEM | 316,507 | 65.8% | D+31.7 | |
| IL-02 | DEM | 289,843 | 67.5% | D+35.1 | |
| IL-03 | DEM | 259,908 | 67.3% | D+34.6 | |
| IL-04 | DEM | 206,396 | 67.5% | D+40.2 | |
| IL-05 | Mike QuigleyDEM | DEM | 363,965 | 69.0% | D+37.9 |
| IL-06 | Sean CastenDEM | DEM | 362,849 | 54.2% | D+8.4 |
| IL-07 | DEM | 267,152 | 83.3% | D+66.6 | |
| IL-08 | DEM | 303,073 | 57.1% | D+14.1 | |
| IL-09 | DEM | 338,828 | 68.4% | D+36.8 | |
| IL-10 | DEM | 327,621 | 59.9% | D+19.9 | |
| IL-11 | Bill FosterDEM | DEM | 359,684 | 55.6% | D+11.2 |
| IL-12 | Mike BostREP | REP | 367,629 | 74.2% | R+48.4 |
| IL-13 | DEM | 329,500 | 58.1% | D+16.2 | |
| IL-14 | DEM | 332,929 | 55.1% | D+10.2 | |
| IL-15 | REP | 310,234 | 99.5% | R+99.5 | |
| IL-16 | Darin LahoodREP | REP | 311,108 | 99.9% | R+99.9 |
| IL-17 | DEM | 312,828 | 54.4% | D+8.8 |