- Lead
- 29,954
- Total
- 56,673
- vs nation
- R+51.4
Indiana 18th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 29,497
- Total
- 59,112
- vs nation
- R+54.4
- Lead
- 27,866
- Total
- 54,901
- vs nation
- R+52.8
- Lead
- 18,236
- Total
- 52,126
- vs nation
- R+38.8
- Lead
- 12,446
- Total
- 56,187
- vs nation
- R+29.4
- Lead
- 24,199
- Total
- 53,530
- vs nation
- R+42.7
- Lead
- 18,407
- Total
- 51,547
- vs nation
- R+36.2
- Lead
- 11,873
- Total
- 50,980
- vs nation
- R+31.8
Key facts
- 2024 presidential margin
- R+52.9MIT Election Lab
- Population
- 133,3442024 5-year
- Population density
- 82 / sq mi2024 5-year · TIGER/Line
- Land area
- 1,631 sq miTIGER/Line
- Median household income
- $66,6452024 5-year
- White (non-Hispanic)
- 85.0%2024 5-year
- Black
- 2.1%2024 5-year
- Hispanic / Latino
- 8.3%2024 5-year
- Peak Democratic margin
- D+20.7 in 1912MIT Election Lab
- Peak Republican margin
- R+52.9 in 2024MIT Election Lab
- Most similar
- State Senate District 39, IN · twin score 97.4
presidential history
Party record book
Indiana 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
Franklin D. Roosevelt1932
54.6%
28,218 votes · D+11.0 · modeled estimate
Runner-up · Lyndon B. Johnson, 1964 · 52.5%
Republican
Donald Trump2024
75.6%
42,855 votes · R+52.9 · modeled estimate
Runner-up · Richard Nixon, 1972 · 73.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Lyndon B. Johnson1964
28,233votes
52.5% of the vote · D+5.5 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1932 · 28,218 votes
Republican
Donald Trump2020
43,671votes
73.9% of the vote · R+49.9 · modeled estimate
Runner-up · Donald Trump, 2024 · 42,855 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
James M. Cox1920
+12.2pts D vs U.S.
Place R+14.0 · U.S. R+26.2 · modeled estimate
Runner-up · William J. Bryan, 1908 · +7.5 pts
Republican
Donald Trump2020
+54.4pts R vs U.S.
Place R+49.9 · U.S. D+4.5 · modeled estimate
Runner-up · Donald Trump, 2016 · +52.8 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 |
|---|---|---|---|---|
| 2020 | R | 26.8%10,499 | 73.2%28,633 | 39,132 |
With a 2024 presidential margin of R+52.9, this district ranks among the most heavily one-sided in the state, reflecting a rural and small-city electorate that has moved decisively away from statewide competitiveness.
Across the recorded series it reached a Democratic high of 20.7 points in 1912 and a Republican high of 52.9 points in 2024. Between 2020 and 2024 the district moved 3.0 points toward the Republican candidate; the 2024 margin was 52.9 points.
A population of 133,344, a 85% non-Hispanic-white share, and a median household income of $66,645 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 39 and State Senate District 17.
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 →
Indiana 18th State Senate District. Akashic. https://akashic.app/sld-upper/18018/. Accessed May 20, 2026. License: CC BY 4.0.