- Lead
- 17,499
- Total
- 73,351
- vs nation
- R+22.4
Indiana 21st State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 17,061
- Total
- 69,104
- vs nation
- R+29.1
- Lead
- 17,837
- Total
- 57,596
- vs nation
- R+33.1
- Lead
- 12,641
- Total
- 54,767
- vs nation
- R+26.9
- Lead
- 6,593
- Total
- 56,009
- vs nation
- R+19.0
- Lead
- 18,125
- Total
- 51,122
- vs nation
- R+33.0
- Lead
- 12,520
- Total
- 44,138
- vs nation
- R+28.9
- Lead
- 8,203
- Total
- 41,994
- vs nation
- R+28.1
Key facts
- 2024 presidential margin
- R+23.9MIT Election Lab
- Population
- 137,4042024 5-year
- Population density
- 302 / sq mi2024 5-year · TIGER/Line
- Land area
- 456 sq miTIGER/Line
- Median household income
- $79,9032024 5-year
- White (non-Hispanic)
- 82.7%2024 5-year
- Black
- 5.8%2024 5-year
- Hispanic / Latino
- 4.7%2024 5-year
- Peak Democratic margin
- D+14.7 in 1964MIT Election Lab
- Peak Republican margin
- R+45.9 in 1972MIT Election Lab
- Most similar
- State Senate District 7, IN · twin score 84.1
presidential history
Party record book
Indiana 21st 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
57.0%
20,212 votes · D+14.7 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 56.0%
Republican
Richard Nixon1972
72.7%
25,381 votes · R+45.9 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 68.7%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Kamala Harris2024
27,229votes
37.1% of the vote · R+23.9 · modeled estimate
Runner-up · Joe Biden, 2020 · 25,272 votes
Republican
Donald Trump2024
44,728votes
61.0% of the vote · R+23.9 · modeled estimate
Runner-up · Donald Trump, 2020 · 42,333 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
+10.8pts D vs U.S.
Place R+15.4 · U.S. R+26.2 · modeled estimate
Runner-up · John W. Davis, 1924 · +6.9 pts
Republican
Donald Trump2016
+33.1pts R vs U.S.
Place R+31.0 · U.S. D+2.1 · modeled estimate
Runner-up · George W. Bush, 2004 · +33.0 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 | 36.9%23,008 | 63.1%39,339 | 62,347 |
Indiana 21st State Senate District sits in the Upper Midwest. In 2024 it voted Republican.
Across the recorded series it reached a Democratic high of 14.7 points in 1964 and a Republican high of 45.9 points in 1972. Between 2020 and 2024 the district moved 0.8 points toward the Democratic candidate; the 2024 margin was 23.9 points.
A population of 137,404, a 83% non-Hispanic-white share, and a median household income of $79,903 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 7 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 21st State Senate District. Akashic. https://akashic.app/sld-upper/18021/. Accessed May 20, 2026. License: CC BY 4.0.