Iowa's 1st congressional district Recent election results Recent election results

| Year_ | Party_Affiliation_1 | Winner | Number_of_Votes_3 | Party_Affiliation_4 | Loser | Number_of_Votes_6 | Percentage_of_Votes_ |
|---|---|---|---|---|---|---|---|
| 1966 | Republican | Fred Schwengel | 64795 | Democrat | John R. Schmidhauser | 60534 | 51% - 48% |
| 1968 | Republican | Fred Schwengel | 91419 | Democrat | John R. Schmidhauser | 81049 | 53% - 47% |
| 1970 | Republican | Fred Schwengel | 60270 | Democrat | Edward Mezvinsky | 59505 | 50% - 49% |
| 1972 | Democrat | Edward Mezvinsky | 107099 | Republican | Fred Schwengel | 91609 | 53% - 46% |
| 1974 | Democrat | Edward Mezvinsky | 75687 | Republican | James A. Leach | 63540 | 54% - 46% |
| 1976 | Republican | James A. Leach | 109694 | Democrat | Edward Mezvinsky | 101024 | 52% - 48% |
| 1978 | Republican | James A. Leach | 79940 | Democrat | Richard E. Meyers | 45037 | 63% - 36% |
| 1980 | Republican | James A. Leach | 133349 | Democrat | Jim Larew | 72602 | 64% - 35% |