| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IL-01 | Bobby L RushDEM | DEM | 203,113 | 85.7% | D+73.0 |
| IL-02 | DEM | 183,543 | 94.1% | D+94.1 | |
| IL-03 | DEM | 209,916 | 65.3% | D+33.3 | |
| IL-04 | DEM | 91,135 | 93.6% | D+93.6 | |
| IL-05 | DEM | 183,326 | 64.1% | D+28.2 | |
| IL-06 | Henry J HydeREP | REP | 205,954 | 64.3% | R+30.9 |
| IL-07 | DEM | 181,095 | 82.6% | D+67.5 | |
| IL-08 | REP | 205,305 | 62.2% | R+26.1 | |
| IL-09 | DEM | 196,082 | 63.4% | D+26.8 | |
| IL-10 | REP | 210,773 | 69.1% | R+38.2 | |
| IL-11 | REP | 212,284 | 51.8% | R+3.5 | |
| IL-12 | DEM | 209,519 | 71.6% | D+45.0 | |
| IL-13 | REP | 236,344 | 59.9% | R+19.9 | |
| IL-14 | REP | 208,764 | 64.4% | R+28.8 | |
| IL-15 | REP | 211,084 | 57.3% | R+14.7 | |
| IL-16 | REP | 228,100 | 60.3% | R+20.6 | |
| IL-17 | Lane EvansDEM | DEM | 231,173 | 51.9% | D+4.7 |
| IL-18 | Ray LahoodREP | REP | 241,523 | 59.3% | R+18.5 |
| IL-19 | DEM | 237,955 | 66.7% | D+34.9 | |
| IL-20 | REP | 240,618 | 50.3% | R+0.5 |