- Lead
- 6,454
- Total
- 208,886
- vs nation
- R+1.6
Ohio 18th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 5,765
- Total
- 214,710
- vs nation
- R+7.1
- Lead
- 10,361
- Total
- 196,819
- vs nation
- R+7.4
- Lead
- 10,233
- Total
- 199,379
- vs nation
- D+1.3
- Lead
- 11,762
- Total
- 205,240
- vs nation
- R+1.5
- Lead
- 2,685
- Total
- 207,733
- vs nation
- D+3.8
- Lead
- 3,092
- Total
- 176,682
- vs nation
- R+2.3
- Lead
- 7,632
- Total
- 169,113
- vs nation
- R+4.0
Key facts
- 2024 presidential margin
- R+3.1MIT Election Lab
- Population
- 371,3942024 5-year
- Population density
- 1,024 / sq mi2024 5-year · TIGER/Line
- Land area
- 363 sq miTIGER/Line
- Median household income
- $86,7342024 5-year
- White (non-Hispanic)
- 80.5%2024 5-year
- Black
- 7.8%2024 5-year
- Hispanic / Latino
- 4.3%2024 5-year
- Peak Democratic margin
- D+20.5 in 1964MIT Election Lab
- Peak Republican margin
- R+57.5 in 1904MIT Election Lab
- Most similar
- State Senate District 24, OH · twin score 89.0
presidential history
Party record book
Ohio 18th State Senate District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 (partial returns from 1876) · 38 presidential cycles · 38 with a vote-share denominator · 34 with a national benchmark
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Lyndon B. Johnson1964
60.2%
88,735 votes · D+20.5 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 52.9%
Republican
Theodore Roosevelt1904
75.1%
14,141 votes · R+57.5 · modeled estimate
Runner-up · Warren G. Harding, 1920 · 74.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Barack Obama2008
106,823votes
52.0% of the vote · D+5.7 · modeled estimate
Runner-up · John Kerry, 2004 · 104,695 votes
Republican
Donald Trump2020
108,978votes
50.8% of the vote · R+2.7 · modeled estimate
Runner-up · Donald Trump, 2024 · 106,783 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
John Kerry2004
+3.8pts D vs U.S.
Place D+1.3 · U.S. R+2.5 · modeled estimate
Runner-up · Barack Obama, 2012 · +1.3 pts
Republican
Herbert Hoover1932
+40.4pts R vs U.S.
Place R+22.6 · U.S. D+17.8 · modeled estimate
Runner-up · Theodore Roosevelt, 1904 · +37.8 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.
| Year | Vote lead | Democratic | Republican | Total |
|---|---|---|---|---|
| 2024 | R | 46.0%81,281 | 54.0%95,388 | 176,669 |
| 2020 | R | 46.8%88,817 | 53.2%100,906 | 189,723 |
Ohio 18th State Senate District sits in the Industrial Midwest. In 2024 it voted Republican.
Across the recorded series it reached a Democratic high of 20.5 points in 1964 and a Republican high of 57.5 points in 1904. The 2024 margin was 3.1 points.
A population of 371,394, a 81% non-Hispanic-white share, and a median household income of $86,734 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 24 and State Senate District 45.
The state-senate districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
District research tools
Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →
Ohio 18th State Senate District. Akashic. https://akashic.app/sld-upper/39018/. Accessed May 20, 2026. License: CC BY 4.0.