- Lead
- 548
- Total
- 12,168
- vs nation
- R+3.0
Missouri 21st State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 282
- Total
- 12,698
- vs nation
- R+6.7
- Lead
- 849
- Total
- 12,112
- vs nation
- R+9.1
- Lead
- 747
- Total
- 12,036
- vs nation
- R+10.1
- Lead
- 18
- Total
- 13,054
- vs nation
- R+7.4
- Lead
- 1,200
- Total
- 12,321
- vs nation
- R+7.3
- Lead
- 408
- Total
- 10,802
- vs nation
- R+4.3
- Lead
- 92
- Total
- 10,062
- vs nation
- R+9.4
Key facts
- 2024 presidential margin
- R+4.5MIT Election Lab
- Population
- 38,7922024 5-year
- Population density
- 2,873 / sq mi2024 5-year · TIGER/Line
- Land area
- 13.5 sq miTIGER/Line
- Median household income
- $47,7012024 5-year
- White (non-Hispanic)
- 66.6%2024 5-year
- Black
- 9.0%2024 5-year
- Hispanic / Latino
- 14.8%2024 5-year
- Peak Democratic margin
- D+25.4 in 1912MIT Election Lab
- Peak Republican margin
- R+41.0 in 1972MIT Election Lab
- Most similar
- State House District 72, OK · twin score 85.8
presidential history
Party record book
Missouri 21st State House 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. Roosevelt1936
61.4%
6,513 votes · D+23.4 · modeled estimate
Runner-up · Lyndon B. Johnson, 1964 · 55.3%
Republican
Richard Nixon1972
70.5%
6,719 votes · R+41.0 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 69.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Franklin D. Roosevelt1936
6,513votes
61.4% of the vote · D+23.4 · modeled estimate
Runner-up · Barack Obama, 2008 · 6,424 votes
Republican
Dwight D. Eisenhower1952
6,864votes
62.0% of the vote · R+24.2 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 6,818 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
Woodrow Wilson1912
+5.9pts D vs U.S.
Place D+25.4 · U.S. D+19.5 · a third-party candidate carried the Place · modeled estimate
Runner-up · James M. Cox, 1920 · −0.9 pts
Republican
Thomas E. Dewey1944
+25.0pts R vs U.S.
Place R+17.5 · U.S. D+7.5 · modeled estimate
Runner-up · Herbert Hoover, 1928 · +20.7 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Missouri 21st State House District sits in the Border South. In 2024 it voted Republican.
Across the recorded series it reached a Democratic high of 25.4 points in 1912 and a Republican high of 41.0 points in 1972. Between 2020 and 2024 the district moved 2.3 points toward the Republican candidate; the 2024 margin was 4.5 points.
A population of 38,792, a 67% non-Hispanic-white share, and a median household income of $47,701 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 72 and State House District 71.
The state-house 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 →
Missouri 21st State House District. Akashic. https://akashic.app/sld-lower/29021/. Accessed May 20, 2026. License: CC BY 4.0.