| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IL-01 | Bobby L RushDEM | DEM | 148,512 | 75.7% | D+51.5 |
| IL-02 | Mel ReynoldsDEM | DEM | 95,855 | 98.1% | D+98.1 |
| IL-03 | DEM | 170,516 | 54.2% | D+8.3 | |
| IL-04 | DEM | 62,079 | 75.2% | D+50.4 | |
| IL-05 | REP | 138,393 | 54.4% | R+8.9 | |
| IL-06 | Henry J HydeREP | REP | 157,378 | 73.5% | R+49.9 |
| IL-07 | DEM | 117,468 | 79.6% | D+59.1 | |
| IL-08 | REP | 135,879 | 64.9% | R+29.9 | |
| IL-09 | DEM | 142,823 | 66.1% | D+32.2 | |
| IL-10 | REP | 153,075 | 75.0% | R+50.1 | |
| IL-11 | REP | 160,395 | 60.6% | R+21.3 | |
| IL-12 | DEM | 153,810 | 65.9% | D+31.8 | |
| IL-13 | REP | 170,021 | 73.1% | R+46.2 | |
| IL-14 | REP | 144,095 | 76.5% | R+53.0 | |
| IL-15 | REP | 159,731 | 68.2% | R+36.3 | |
| IL-16 | REP | 165,974 | 70.6% | R+41.3 | |
| IL-17 | Lane EvansDEM | DEM | 174,783 | 54.5% | D+9.1 |
| IL-18 | Ray LahoodREP | REP | 199,125 | 60.2% | R+20.8 |
| IL-19 | DEM | 197,040 | 58.4% | D+16.8 | |
| IL-20 | DEM | 196,998 | 54.8% | D+9.7 |