- Lead
- 846
- Total
- 15,708
- vs nation
- R+3.9
Connecticut 66th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 408
- Total
- 15,919
- vs nation
- R+7.0
- Lead
- 1,672
- Total
- 14,616
- vs nation
- R+13.5
- Lead
- 187
- Total
- 13,824
- vs nation
- R+5.2
- Lead
- 1,077
- Total
- 14,840
- vs nation
- Even
- Lead
- 506
- Total
- 14,473
- vs nation
- R+1.0
- Lead
- 682
- Total
- 13,128
- vs nation
- D+4.7
- Lead
- 1,118
- Total
- 12,315
- vs nation
- D+0.6
Key facts
- 2024 presidential margin
- R+5.4MIT Election Lab
- Population
- 23,5892024 5-year
- Population density
- 159 / sq mi2024 5-year · TIGER/Line
- Land area
- 148 sq miTIGER/Line
- Median household income
- $113,4262024 5-year
- White (non-Hispanic)
- 90.2%2024 5-year
- Black
- 0.8%2024 5-year
- Hispanic / Latino
- 3.9%2024 5-year
- Peak Democratic margin
- D+33.9 in 1964MIT Election Lab
- Peak Republican margin
- R+38.5 in 1896MIT Election Lab
- Most similar
- State House District 69, CT · twin score 95.4
presidential history
Party record book
Connecticut 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
Lyndon B. Johnson1964
66.9%
6,179 votes · D+33.9 · modeled estimate
Runner-up · Samuel J. Tilden, 1876 · 53.1%
Republican
Dwight D. Eisenhower1956
69.0%
5,867 votes · R+37.9 · modeled estimate
Runner-up · William McKinley, 1896 · 65.6%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Barack Obama2008
7,835votes
52.8% of the vote · D+7.3 · modeled estimate
Runner-up · Joe Biden, 2020 · 7,626 votes
Republican
Donald Trump2024
8,171votes
52.0% of the vote · R+5.4 · modeled estimate
Runner-up · Donald Trump, 2020 · 8,034 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
Lyndon B. Johnson1964
+11.3pts D vs U.S.
Place D+33.9 · U.S. D+22.6 · modeled estimate
Runner-up · Al Gore, 2000 · +4.7 pts
Republican
William McKinley1896
+32.4pts R vs U.S.
Place R+38.5 · U.S. R+6.1 · modeled estimate
Runner-up · Herbert Hoover, 1932 · +31.4 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 |
|---|---|---|---|---|
| 2020 | R | 47.1%6,053 | 52.9%6,795 | 12,848 |
| 2018 | R | 48.2%4,900 | 51.8%5,258 | 10,158 |
With fewer than 24,000 residents, this state house district bucked Connecticut's statewide Democratic lean by posting an R+5.4 presidential margin in 2024, signaling meaningful ticket-splitting potential in local and legislative races.
Across the recorded series it reached a Democratic high of 33.9 points in 1964 and a Republican high of 38.5 points in 1896. Between 2020 and 2024 the district moved 2.8 points toward the Republican candidate; the 2024 margin was 5.4 points.
A population of 23,589, a 90% non-Hispanic-white share, and a median household income of $113,426 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 69 and State House District 62.
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 66th State House District. Akashic. https://akashic.app/sld-lower/09066/. Accessed May 20, 2026. License: CC BY 4.0.