Ohio's 12th senatorial district

For United States senators, see List of United States senators from Ohio.

Ohio's 12th senatorial district has been based in rural western Ohio. It comprises the counties of Allen, Mercer, Shelby, Champaign as well as portions of Auglaize, Darke and Logan counties. It encompasses Ohio House districts 4, 84 and 85. It has a Cook PVI of R+29. Its Ohio Senator is Republican Susan Manchester.

Ohio's 12th State Senate district
Senator	Susan Manchester R–Waynesfield
Demographics	88% White 6.2% Black 2.3% Hispanic 1% Asian 1.8% Native American 0.3% Hawaiian/Pacific Islander
Population (2020)  • Voting age  • Citizens of voting age	344,252[1] 262,250 257,573

Former senator Keith Faber served as Senate President from 2013 to 2016.

List of senators

Senator	Party	Term	Notes
Tennyson Guyer	Republican	January 3, 1967 – December 31, 1972	Guyer was elected to the United States Congress in 1972.
Walter White	Republican	January 3, 1973 – June 26, 1979	White resigned prior to the expiration of his term in 1980.
Richard Ditto	Republican	July 17, 1979 – December 31, 1980	Ditto lost re-election in 1980 to Steve Maurer.[2]
Steve Maurer	Democrat	January 3, 1981 – December 31, 1984	Maurer lost re-election in 1984 to Robert Cupp.[3]
Robert R. Cupp	Republican	January 3, 1985 – December 31, 2000	Cupp was term-limited in 2000.
Jim Jordan	Republican	January 3, 2001 – December 31, 2006	Jordan was elected to the United States Congress in 2006.
Keith Faber	Republican	January 2, 2007 – December 31, 2016	Faber served as Senate President and was term-limited in 2016.
Matt Huffman	Republican	January 3, 2017 – January 6, 2025	Huffman was elected to the Ohio House of Representatives and is the current Speaker of the Ohio House of Representatives
Susan Manchester	Republican	January 7, 2025 – present	Incumbent