| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IL-01 | Bobby L RushDEM | DEM | 257,885 | 73.5% | D+53.7 |
| IL-02 | DEM | 235,251 | 81.1% | D+62.1 | |
| IL-03 | DEM | 223,334 | 73.0% | D+47.1 | |
| IL-04 | DEM | 166,189 | 86.6% | D+73.2 | |
| IL-05 | Mike QuigleyDEM | DEM | 279,131 | 76.7% | D+53.3 |
| IL-06 | Sean CastenDEM | DEM | 315,446 | 53.6% | D+7.2 |
| IL-07 | DEM | 246,243 | 87.6% | D+75.2 | |
| IL-08 | DEM | 197,127 | 66.0% | D+31.9 | |
| IL-09 | DEM | 290,351 | 73.5% | D+47.0 | |
| IL-10 | DEM | 238,664 | 65.6% | D+31.2 | |
| IL-11 | Bill FosterDEM | DEM | 227,765 | 63.8% | D+27.7 |
| IL-12 | Mike BostREP | REP | 261,543 | 51.6% | R+6.2 |
| IL-13 | Rodney DavisREP | REP | 270,981 | 50.4% | R+0.8 |
| IL-14 | DEM | 297,199 | 52.5% | D+5.0 | |
| IL-15 | REP | 255,608 | 70.9% | R+41.9 | |
| IL-16 | REP | 255,825 | 59.1% | R+18.3 | |
| IL-17 | Cheri BustosDEM | DEM | 229,749 | 62.1% | D+24.2 |
| IL-18 | Darin LahoodREP | REP | 291,413 | 67.2% | R+34.5 |