| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IA-01 | Jim LeachREP | REP | 151,342 | 59.2% | R+18.4 |
| IA-02 | REP | 169,037 | 58.9% | R+17.7 | |
| IA-03 | Cooper EvansREP | REP | 187,675 | 55.5% | R+10.9 |
| IA-04 | Neal SmithDEM | DEM | 179,972 | 66.0% | D+32.4 |
| IA-05 | Tom HarkinDEM | DEM | 158,563 | 58.9% | D+17.7 |
| IA-06 | DEM | 158,184 | 64.3% | D+28.6 |