Ohio State Senate seat · lines in effect since 2024
Ohio Senate District 18
A district of about 366,000 people, 39% of adults with a bachelor's degree. It votes R+3.0 relative to the nation for president.
2024 election
Nov 5, 2024- Jerry Cirino (R) · won54.1%
- Katie O'Neill (D)45.9%
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 | Jerry Cirino (R) | Katie O'Neill (D) | 8.1 |
| Lines first used in 2012 | |||
| 2020 | Jerry Cirino (R) | Betsy Rader (D) | 21.0 |
| 2016 | John J. Eklund (R) | Wiley Runnestrand (D) | 30.5 |
| 2012 | John J. Eklund (R) | Jim Mueller (D) | 9.4 |
| Lines first used in 2002 | |||
| 2008 | Timothy Grendell (R) | — | Unopposed |
| 2004 | Timothy Grendell (R) | John Hawkins (D) | 19.2 |
| Lines first used in 1992 | |||
| 2000 | Robert A. Gardner (R) | Donna McNamee (D) | 19.0 |
| 1996 | Robert A. Gardner (R)Flip | Dan Troy (D) | 3.5 |
| 1992 | Robert J. Boggs (D) | Randy Puraty (R) | 1.1 |
| Lines first used in 1982 | |||
| 1988 | Robert J. Boggs (D) | Kenneth A. Lorenz (R) | 27.7 |
| 1984 | Robert J. Boggs (D) | Dean (R) | 20.3 |
| Lines first used in 1972 | |||
| 1980 | Marcus A. Roberto (D) | Denny Arnold (R) | 13.1 |
| 1976 | Marcus A. Roberto (D)Flip | Dave Johnson (R) | 2.5 |
| 1972 | Anice W. Johnson (R) | Thomas E. Walter (D) | 3.1 |
| Lines first used in 1962 | |||
| 1968 | Oakley C. Collins (R) | J. Sherman Porter (D) | 13.5 |
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 18
The state's districts in other chambers that share residents with this one, and the share of District 18'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 | D+9.8 | No race | D+14.2 | R+3.1 |
| U.S. Senate | R+12.4 | D+22.8 | No race | D+5.4 |
| Governor | No race | D+11.4 | 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 18.
Higher than 78% of seats.
Lower than 59% of seats.
Higher than 50% of seats.
Higher than 56% of seats.
Higher than 75% of seats.
Denser 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. 2 of the 4 flipped this year.
District 2739% college gradsR+5.3Flipped DDistrict 2
36% college gradsR+12.7Not up in 2026District 3
27% college gradsR+10.2Flipped DDistrict 8
40% college gradsR+10.1Not up in 2026
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