| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IL-01 | Bobby L RushDEM | DEM | 252,711 | 82.8% | D+65.6 |
| IL-02 | Mel ReynoldsDEM | DEM | 233,864 | 78.1% | D+64.4 |
| IL-03 | DEM | 255,293 | 63.5% | D+27.0 | |
| IL-04 | DEM | 116,606 | 77.6% | D+55.1 | |
| IL-05 | DEM | 232,083 | 57.3% | D+18.2 | |
| IL-06 | Henry J HydeREP | REP | 251,904 | 65.5% | R+31.0 |
| IL-07 | DEM | 225,281 | 81.2% | D+65.5 | |
| IL-08 | REP | 238,633 | 55.7% | R+15.3 | |
| IL-09 | DEM | 239,703 | 68.0% | D+41.0 | |
| IL-10 | REP | 240,630 | 64.5% | R+29.0 | |
| IL-11 | DEM | 243,247 | 55.7% | D+11.3 | |
| IL-12 | DEM | 236,877 | 71.2% | D+42.5 | |
| IL-13 | REP | 262,255 | 68.3% | R+36.7 | |
| IL-14 | REP | 230,624 | 67.3% | R+34.7 | |
| IL-15 | REP | 239,586 | 59.3% | R+18.8 | |
| IL-16 | REP | 255,943 | 55.6% | R+11.3 | |
| IL-17 | Lane EvansDEM | DEM | 259,952 | 60.1% | D+20.2 |
| IL-18 | REP | 270,976 | 57.8% | R+15.5 | |
| IL-19 | DEM | 270,685 | 69.1% | D+38.3 | |
| IL-20 | DEM | 274,088 | 56.5% | D+13.0 |