- Lead
- 8,142
- Total
- 10,977
- vs nation
- D+75.6
Missouri 66th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 10,372
- Total
- 13,543
- vs nation
- D+72.1
- Lead
- 10,751
- Total
- 14,446
- vs nation
- D+72.3
- Lead
- 11,067
- Total
- 14,736
- vs nation
- D+71.2
- Lead
- 12,656
- Total
- 16,235
- vs nation
- D+70.7
- Lead
- 10,836
- Total
- 14,761
- vs nation
- D+75.9
- Lead
- 9,043
- Total
- 12,944
- vs nation
- D+69.3
- Lead
- 8,132
- Total
- 12,043
- vs nation
- D+59.0
Key facts
- 2024 presidential margin
- D+74.2MIT Election Lab
- Population
- 36,6832024 5-year
- Population density
- 1,485 / sq mi2024 5-year · TIGER/Line
- Land area
- 24.7 sq miTIGER/Line
- Median household income
- $47,7782024 5-year
- White (non-Hispanic)
- 11.7%2024 5-year
- Black
- 82.9%2024 5-year
- Hispanic / Latino
- 1.5%2024 5-year
- Peak Democratic margin
- D+85.8 in 1880MIT Election Lab
- Most similar
- State House District 74, MO · twin score 99.4
presidential history
Party record book
Missouri 66th 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
Winfield S. Hancock1880
92.9%
118 votes · D+85.8 · modeled estimate
Runner-up · Grover Cleveland, 1884 · 91.7%
Republican
George H. W. Bush1988
18.7%
2,154 votes · D+62.6 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 14.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Barack Obama2008
14,421votes
88.8% of the vote · D+78.0 · modeled estimate
Runner-up · Barack Obama, 2012 · 12,876 votes
Republican
Ronald Reagan1984
2,549votes
14.9% of the vote · D+28.9 · modeled estimate
Runner-up · Richard Nixon, 1972 · 2,156 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
+75.9pts D vs U.S.
Place D+73.4 · U.S. R+2.5 · modeled estimate
Runner-up · Kamala Harris, 2024 · +75.6 pts
Republican
William H. Taft1912
−22.2pts R vs U.S.
Place D+41.7 · U.S. D+19.5 · a third-party candidate carried the Place · modeled estimate
Runner-up · Alf Landon, 1936 · −26.6 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
With a 2024 presidential margin of D+74.2, this St. Louis-area district ranks among the most reliably Democratic state house seats in Missouri, reflecting dense urban settlement and a heavily minority population.
Across the recorded series it reached a Democratic high of 85.8 points in 1880. Between 2020 and 2024 the district moved 2.4 points toward the Republican candidate; the 2024 margin was 74.2 points.
A population of 36,683, a 12% non-Hispanic-white share, and a median household income of $47,778 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 74 and State House District 73.
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 66th State House District. Akashic. https://akashic.app/sld-lower/29066/. Accessed May 20, 2026. License: CC BY 4.0.