Hardenbergh | | Democratic | 1874 | | Incumbent retired.New member elected.Republican gain. | nowrap | |} New York |- ! | James W. Covert | | Democratic | 1876 | Incumbent re-elected. | nowrap | |- ! | William D. Veeder | | Democratic | 1876 | | Incumbent retired.New member elected.Independent Democratic gain. | nowrap | |- ! | Simeon B. Chittenden | | Republican | 1874 | Incumbent re-elected. | nowrap | |- ! | Archibald M. Bliss | | Democratic | 1874 | Incumbent re-elected. | nowrap | |- ! | Nicholas Muller | | Democratic | 1874 | Incumbent re-elected. | nowrap | |- ! | Samuel S. Cox | | Democratic | 1873 | Incumbent re-elected. | nowrap | |- ! | Anthony Eickhoff | | Democratic | 1876 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | Anson G. McCook | | Republican | 1876 | Incumbent re-elected. | nowrap | |- ! | Fernando Wood | | Democratic | 1866 | Incumbent re-elected. | nowrap | |- ! | Abram Hewitt | | Democratic | 1874 | | Incumbent retired.New member elected.Independent Democratic gain. | nowrap | |- ! | Benjamin A. Willis | | Democratic | 1874 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | Clarkson Nott Potter | | Democratic | 1876 | | Incumbent retired.New member elected.Republican gain. | nowrap | |- ! | John H. Ketcham | | Republican | 1876 | Incumbent re-elected. | nowrap | |- ! | George M. Beebe | | Democratic | 1874 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | Stephen L. Mayham | | Democratic | 1876 | | Incumbent retired.New member elected.Democratic hold. | nowrap | |- ! | Terence J. Quinn | | Democratic | 1876 | | Incumbent Terence J. Quinn died June 18, 1878.New member elected.Republican gain.Successor also elected the same day to finish the term. | nowrap | |- ! | Martin I. Townsend | | Republican | 1874 | | Incumbent retired.New member elected.Republican hold. | nowrap | |- ! | Andrew Williams | | Republican | 1874 | | Incumbent retired.New member elected.Republican hold. | nowrap | |- ! | Amaziah B. James | | Republican | 1876 | Incumbent re-elected. | nowrap | |- ! |