| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IL-01 | Bobby L RushDEM | DEM | 196,186 | 87.8% | D+75.6 |
| IL-02 | DEM | 195,901 | 89.8% | D+79.7 | |
| IL-03 | DEM | 192,503 | 75.6% | D+51.2 | |
| IL-04 | DEM | 100,963 | 88.6% | D+88.6 | |
| IL-05 | DEM | 162,889 | 87.3% | D+87.3 | |
| IL-06 | Henry J HydeREP | REP | 226,207 | 58.9% | R+17.9 |
| IL-07 | DEM | 191,027 | 85.9% | D+71.9 | |
| IL-08 | REP | 232,695 | 61.0% | R+22.0 | |
| IL-09 | DEM | 192,346 | 76.4% | D+52.9 | |
| IL-10 | REP | 237,506 | 51.2% | R+2.4 | |
| IL-11 | REP | 234,869 | 56.4% | R+12.7 | |
| IL-12 | DEM | 183,257 | 100.0% | D+100.0 | |
| IL-13 | Judy BiggertREP | REP | 292,018 | 66.2% | R+32.4 |
| IL-14 | REP | 254,909 | 74.0% | R+48.0 | |
| IL-15 | REP | 236,622 | 53.2% | R+6.5 | |
| IL-16 | REP | 267,005 | 66.7% | R+33.5 | |
| IL-17 | Lane EvansDEM | DEM | 241,347 | 54.9% | D+9.8 |
| IL-18 | Ray LahoodREP | REP | 259,023 | 67.1% | R+34.1 |
| IL-19 | DEM | 240,238 | 64.6% | D+29.1 | |
| IL-20 | REP | 255,775 | 63.1% | R+26.2 |