United States House of Representatives elections, 1858 Ohio Ohio

| District | Incumbent | Party | First_elected | Result_ | Candidates |
|---|---|---|---|---|---|
| Ohio 5 | Richard Mott | Republican | 1854 | Retired Republican hold | James M. Ashley (R) 51.3% William Mungen (D) 48.7% |
| Ohio 7 | Aaron Harlan | Republican | 1852 | Lost renomination Republican hold | Thomas Corwin (R) 63.8% Charles W. Blair (D) 36.2% |
| Ohio 9 | Lawrence W. Hall | Democratic | 1856 | Lost re-election Republican gain | John Carey (R) 50.3% Lawrence W. Hall (R) 49.7% |
| Ohio 10 | Joseph Miller | Democratic | 1856 | Lost re-election Republican gain | Carey A. Trimble (R) 55.0% Joseph Miller (D) 45.0% |
| Ohio 12 | Samuel S. Cox | Democratic | 1856 | Re-elected | Samuel S. Cox (R) 51.8% Lucius Case (D) 48.2% |