| | Incumbent retired.New member elected.Republican gain. | nowrap | |- ! | Thomas R. Cobb | | Democratic | 1876 | Incumbent re-elected. | nowrap | |- ! | George A. Bicknell | | Democratic | 1876 | Incumbent re-elected. | nowrap | |- ! | Leonidas Sexton | | Republican | 1876 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Thomas M. Browne | | Republican | 1876 | Incumbent re-elected. | nowrap | |- ! | Milton S. Robinson | | Republican | 1874 | | Incumbent retired.New member elected.Democratic gain. | nowrap | |- ! | John Hanna | | Republican | 1876 | | Incumbent lost re-election.New member elected.Greenback gain. | nowrap | |- ! | Morton C. Hunter | | Republican | 1872 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Michael D. White | | Republican | 1876 | | Incumbent retired.New member elected.Republican hold. | nowrap | |- ! | William H. Calkins | | Republican | 1876 | Incumbent re-elected. | nowrap | |- ! | James L. Evans | | Republican | 1874 | | Incumbent retired.New member elected.Republican hold. | nowrap | |- ! | Andrew H. Hamilton | | Democratic | 1874 | | Incumbent retired.New member elected.Democratic hold. | nowrap | |- ! | John Baker | | Republican | 1874 | Incumbent re-elected. | nowrap | |} Iowa |- ! | Joseph C. Stone | | Republican | 1876 | | Lost re-nominationRepublican hold. | nowrap | |- ! | Hiram Price | | Republican | 1876 | Incumbent re-elected. | nowrap | |- ! | Theodore W. Burdick | | Republican | 1876 | | Incumbent retired.New member elected.Republican hold. | nowrap | |- ! | Nathaniel C. Deering | | Republican | 1876 | Incumbent re-elected. | nowrap | |- ! | Rush Clark | | Republican | 1876 | Incumbent re-elected. | nowrap | |- ! | Ezekiel S. Sampson | | Republican | 1874 | | Incumbent lost re-election.New member elected.Greenback gain. | nowrap | |- ! | Henry J. B. Cummings | | Republican | 1876 | | Incumbent lost re-election.New member elected.Greenback gain. | nowrap | |- ! | William F. Sapp | | Republican | 1876 | Incumbent re-elected. | nowrap | |- ! | S. Addison