| District ▲ | Winner | Party | Votes | % | Margin |
|---|---|---|---|---|---|
| IA-01 | REP | 211,204 | 51.9% | R+4.1 | |
| IA-02 | DEM | 204,550 | 50.3% | D+1.3 | |
| IA-03 | REP | 208,938 | 56.5% | R+12.9 | |
| IA-04 | Neal SmithDEM | DEM | 210,356 | 69.1% | D+38.2 |
| IA-05 | Tom HarkinDEM | DEM | 209,052 | 64.9% | D+30.7 |
| IA-06 | DEM | 198,002 | 67.4% | D+36.0 |