| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IA-01 | Jim LeachREP | REP | 130,825 | 66.4% | R+32.8 |
| IA-02 | REP | 144,630 | 61.3% | R+22.7 | |
| IA-03 | DEM | 152,920 | 54.6% | D+9.2 | |
| IA-04 | Neal SmithDEM | DEM | 156,952 | 68.3% | D+36.7 |
| IA-05 | REP | 143,589 | 59.2% | R+18.4 | |
| IA-06 | Fred GrandyREP | REP | 160,679 | 51.0% | R+1.9 |