- Lead
- 2,895
- Total
- 6,390
- vs nation
- D+46.8
Connecticut 129th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 4,242
- Total
- 7,906
- vs nation
- D+49.2
- Lead
- 3,647
- Total
- 7,148
- vs nation
- D+48.9
- Lead
- 2,929
- Total
- 6,531
- vs nation
- D+41.0
- Lead
- 3,553
- Total
- 6,989
- vs nation
- D+43.6
- Lead
- 2,518
- Total
- 6,455
- vs nation
- D+41.5
- Lead
- 2,560
- Total
- 6,055
- vs nation
- D+41.8
- Lead
- 2,262
- Total
- 5,679
- vs nation
- D+31.3
Key facts
- 2024 presidential margin
- D+45.3MIT Election Lab
- Population
- 24,7002024 5-year
- Population density
- 10,292 / sq mi2024 5-year · TIGER/Line
- Land area
- 2.4 sq miTIGER/Line
- Median household income
- $73,5942024 5-year
- White (non-Hispanic)
- 26.3%2024 5-year
- Black
- 26.1%2024 5-year
- Hispanic / Latino
- 38.0%2024 5-year
- Peak Democratic margin
- D+53.7 in 2020MIT Election Lab
- Peak Republican margin
- R+16.1 in 1924MIT Election Lab
- Most similar
- State House District 10, CT · twin score 94.2
presidential history
Party record book
Connecticut 129th 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
Lyndon B. Johnson1964
76.7%
4,218 votes · D+53.4 · modeled estimate
Runner-up · Joe Biden, 2020 · 76.2%
Republican
Dwight D. Eisenhower1956
52.7%
2,048 votes · R+5.3 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · 50.8%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
6,027votes
76.2% of the vote · D+53.7 · modeled estimate
Runner-up · Hillary Clinton, 2016 · 5,281 votes
Republican
Ronald Reagan1984
2,621votes
47.7% of the vote · D+4.4 · modeled estimate
Runner-up · Richard Nixon, 1972 · 2,374 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
Joe Biden2020
+49.2pts D vs U.S.
Place D+53.7 · U.S. D+4.5 · modeled estimate
Runner-up · Hillary Clinton, 2016 · +48.9 pts
Republican
Calvin Coolidge1924
−9.0pts R vs U.S.
Place R+16.1 · U.S. R+25.2 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1956 · −10.1 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
With a 2024 presidential margin of D+45.3, this Hartford-area district ranks among the most heavily Democratic state house seats in Connecticut, reflecting the dense urban concentration that drives its outsized partisan lean.
Across the recorded series it reached a Democratic high of 53.7 points in 2020 and a Republican high of 16.1 points in 1924. Between 2020 and 2024 the district moved 8.4 points toward the Republican candidate; the 2024 margin was 45.3 points.
A population of 24,700, a 26% non-Hispanic-white share, and a median household income of $73,594 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 10 and Assembly 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 →
Connecticut 129th State House District. Akashic. https://akashic.app/sld-lower/09129/. Accessed May 20, 2026. License: CC BY 4.0.