- Lead
- 7,572
- Total
- 37,609
- vs nation
- D+21.6
Kansas 21st State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 8,178
- Total
- 40,133
- vs nation
- D+15.9
- Lead
- 2,748
- Total
- 34,203
- vs nation
- D+5.9
- Lead
- 1,882
- Total
- 31,297
- vs nation
- R+9.9
- Lead
- 836
- Total
- 32,677
- vs nation
- R+4.7
- Lead
- 3,491
- Total
- 29,225
- vs nation
- R+9.5
- Lead
- 3,060
- Total
- 24,609
- vs nation
- R+13.0
- Lead
- 2,475
- Total
- 21,646
- vs nation
- R+20.0
Key facts
- 2024 presidential margin
- D+20.1MIT Election Lab
- Population
- 74,5092024 5-year
- Population density
- 2,596 / sq mi2024 5-year · TIGER/Line
- Land area
- 28.7 sq miTIGER/Line
- Median household income
- $81,3152024 5-year
- White (non-Hispanic)
- 70.4%2024 5-year
- Black
- 8.1%2024 5-year
- Hispanic / Latino
- 12.3%2024 5-year
- Peak Democratic margin
- D+30.3 in 1912MIT Election Lab
- Peak Republican margin
- R+45.9 in 1892MIT Election Lab
- Most similar
- State Senate District 8, KS · twin score 95.2
presidential history
Party record book
Kansas 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
Kamala Harris2024
59.1%
22,241 votes · D+20.1 · modeled estimate
Runner-up · Joe Biden, 2020 · 58.7%
Republican
Richard Nixon1972
69.4%
7,781 votes · R+41.1 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 67.4%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
23,561votes
58.7% of the vote · D+20.4 · modeled estimate
Runner-up · Kamala Harris, 2024 · 22,241 votes
Republican
Mitt Romney2012
16,196votes
51.7% of the vote · R+6.0 · modeled estimate
Runner-up · George W. Bush, 2004 · 16,180 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
Kamala Harris2024
+21.6pts D vs U.S.
Place D+20.1 · U.S. R+1.5 · modeled estimate
Runner-up · William J. Bryan, 1908 · +20.8 pts
Republican
Benjamin Harrison1892
+47.5pts R vs U.S.
Place R+45.9 · U.S. D+1.7 · a third-party candidate carried the Place · modeled estimate
Runner-up · Thomas E. Dewey, 1944 · +31.3 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 | D | 57.2%22,480 | 42.8%16,807 | 39,287 |
Kansas 21st State Senate District sits in the Great Plains. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 30.3 points in 1912 and a Republican high of 45.9 points in 1892. The 2024 margin was 20.1 points.
A population of 74,509, a 70% non-Hispanic-white share, and a median household income of $81,315 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 8 and State Senate District 7.
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 →
Kansas 21st State Senate District. Akashic. https://akashic.app/sld-upper/20021/. Accessed May 20, 2026. License: CC BY 4.0.