- Democratic congressional and state primaries: mixed
- Republican congressional and state primaries: mixed
- Democratic Presidential primary: mixed
- Republican Presidential primary: mixed
- Ohio has nonpartisan registration. There is no option to affiliate with a political party on the voter registration form.
Details of voting in congressional and state primary elections:
- All registered voters choose one party's ballot to cast their vote in the primary. This choice designates the voter's party affiliation.
- An unaffiliated voter may decide not to participate in either party's primary and will be given the amendments/referendum ballot only.