Ohio State Senate seat · lines in effect since 2024
Ohio Senate District 10
A district of about 347,000 people, 31% of adults with a bachelor's degree. It votes R+27.2 relative to the nation for president.
2024 election
Nov 5, 2024- Kyle Koehler (R) · won65.2%
- Dan McGregor (D)34.8%
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 12:13 PM ET
Where it sits among all 33 seats
Every Ohio State Senate seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every election for this seat
15 races since 1968; the seat changed party 2 times. District numbers are redrawn after each census: each group is one set of lines.
| Year | Winner | Runner-up | Won by |
|---|---|---|---|
| Lines first used in 2024 | |||
| 2024 | Kyle Koehler (R) | Dan McGregor (D) | 30.5 |
| Lines first used in 2012 | |||
| 2020 | Robert D. Hackett (R) | Charles Ballard (D) | 30.6 |
| 2016 | Robert D. Hackett (R) | Matthew Kirk (D) | 30.3 |
| 2012 | Chris Widener (R) | Jeff Robertson (D) | 22.6 |
| Lines first used in 2002 | |||
| 2008 | Chris Widener (R) | Roger D. Tackett (D) | 24.2 |
| 2004 | Steve Austria (R) | Charles E. Hart (D) | 29.0 |
| Lines first used in 1992 | |||
| 2000 | Steve Austria (R) | Roger D. Tackett (D) | 27.6 |
| 1996 | Merle Grace Kearns (R) | Dale Henry (D) | 33.1 |
| 1992 | Merle Grace Kearns (R) | Roger D. Tackett (D) | 16.1 |
| Lines first used in 1982 | |||
| 1988 | David Hobson (R) | Roger D. Tackett (D) | 30.9 |
| 1984 | David Hobson (R) | Roger D. Tackett (D) | 7.3 |
| Lines first used in 1972 | |||
| 1980 | Michael DeWine (R)Flip | John K. Mahoney (D) | 21.2 |
| 1976 | John K. Mahoney (D)Flip | Max H. Dennis (R) | 2.3 |
| 1972 | Max H. Dennis (R) | Robert Thompson (D) | 18.7 |
| Lines first used in 1962 | |||
| 1968 | Max H. Dennis (R) | — | Unopposed |
Won by: the winner's lead over the runner-up, in points of the vote. Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Districts that overlap District 10
The state's districts in other chambers that share residents with this one, and the share of District 10's area in each.
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2016 | 2018 | 2020 | 2024 | |
|---|---|---|---|---|
| President | R+29.2 | No race | R+25.7 | R+27.5 |
| U.S. Senate | R+44.3 | R+16.2 | No race | R+19.9 |
| Governor | No race | R+29.6 | No race | No race |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 8, 2026, 7:01 PM ET
Who lives here, compared
Grey bars show the spread of all 33 seats. Small marks are other seats in Ohio. The black marker is District 10.
Higher than 50% of seats.
Higher than 59% of seats.
Lower than 53% of seats.
Lower than 66% of seats.
Lower than 56% of seats.
Less dense than 53% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
District 2030% college gradsR+28.8Not up in 2026District 22
28% college gradsR+33.6Not up in 2026District 5
25% college gradsR+36.2Held RDistrict 29
26% college gradsR+19.5Held R
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET