Ohio's 9th senatorial district has historically been a minority majority district based in urban Cincinnati. Currently it comprises central Hamilton County. It encompasses Ohio House districts 31, 32 and 33. It has a Cook PVI of D+18. Its current Ohio Senator is Democrat Catherine Ingram. She resides in Cincinnati, a city located in Hamilton county.
| Senator | Party | Term | Notes | ||
|---|---|---|---|---|---|
| Calvin C. Johnson | Democrat | January 3, 1967 – February 9, 1970 | Johnson resigned prior to the expiration of his term. | ||
| Bill Bowen | Democrat | February 11, 1970 – December 31, 1994 | Bowen did not seek re-election in 1994. | ||
| Janet C. Howard | Republican | January 3, 1995 – December 31, 1998 | Howard lost re-election in 1998 to Mark Mallory. | ||
| Mark Mallory | Democrat | January 5, 1999 – December 1, 2005 | Mallory resigned to become mayor of Cincinnati, Ohio. | ||
| Eric Kearney | Democrat | December 6, 2005 – December 31, 2014 | Kearney was term-limited in 2014. | ||
| Cecil Thomas | Democrat | January 6, 2015 – December 31, 2022 | Thomas was term-limited in 2022. | ||
| Catherine Ingram | Democrat | January 3, 2023 – present | Incumbent |