| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IA-01 | Jim LeachREP | REP | 125,955 | 63.5% | R+27.7 |
| IA-02 | REP | 138,978 | 52.3% | R+5.2 | |
| IA-03 | REP | 138,539 | 74.8% | R+49.6 | |
| IA-04 | Neal SmithDEM | DEM | 136,834 | 64.7% | D+29.4 |
| IA-05 | Tom HarkinDEM | DEM | 139,710 | 58.9% | D+17.9 |
| IA-06 | DEM | 131,459 | 66.3% | D+32.6 |