| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IL-01 | Bobby L RushDEM | DEM | 174,365 | 87.1% | D+76.5 |
| IL-02 | DEM | 166,668 | 89.4% | D+79.8 | |
| IL-03 | DEM | 159,899 | 72.5% | D+45.0 | |
| IL-04 | DEM | 66,356 | 81.8% | D+65.9 | |
| IL-05 | DEM | 129,425 | 74.0% | D+47.9 | |
| IL-06 | Henry J HydeREP | REP | 165,708 | 67.3% | R+37.2 |
| IL-07 | DEM | 140,968 | 92.9% | D+92.9 | |
| IL-08 | REP | 151,856 | 68.7% | R+37.3 | |
| IL-09 | DEM | 144,610 | 74.6% | D+51.5 | |
| IL-10 | REP | 138,429 | 100.0% | R+100.0 | |
| IL-11 | REP | 171,055 | 58.8% | R+17.6 | |
| IL-12 | DEM | 165,014 | 60.4% | D+20.7 | |
| IL-13 | Judy BiggertREP | REP | 199,767 | 61.0% | R+22.0 |
| IL-14 | REP | 168,148 | 69.8% | R+39.5 | |
| IL-15 | REP | 169,309 | 61.6% | R+23.1 | |
| IL-16 | REP | 143,686 | 100.0% | R+100.0 | |
| IL-17 | Lane EvansDEM | DEM | 194,200 | 51.6% | D+3.1 |
| IL-18 | Ray LahoodREP | REP | 158,177 | 100.0% | R+100.0 |
| IL-19 | DEM | 210,044 | 58.3% | D+16.6 | |
| IL-20 | REP | 197,578 | 61.3% | R+22.6 |