- Lead
- 13,030
- Total
- 47,488
- vs nation
- D+28.9
Connecticut 25th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 17,473
- Total
- 49,725
- vs nation
- D+30.7
- Lead
- 12,672
- Total
- 43,701
- vs nation
- D+26.9
- Lead
- 8,271
- Total
- 40,781
- vs nation
- D+16.4
- Lead
- 11,867
- Total
- 42,883
- vs nation
- D+20.4
- Lead
- 5,757
- Total
- 40,854
- vs nation
- D+16.5
- Lead
- 7,125
- Total
- 38,056
- vs nation
- D+18.2
- Lead
- 6,102
- Total
- 36,155
- vs nation
- D+8.4
Key facts
- 2024 presidential margin
- D+27.4MIT Election Lab
- Population
- 101,5942024 5-year
- Population density
- 3,479 / sq mi2024 5-year · TIGER/Line
- Land area
- 29.2 sq miTIGER/Line
- Median household income
- $113,0502024 5-year
- White (non-Hispanic)
- 52.1%2024 5-year
- Black
- 10.7%2024 5-year
- Hispanic / Latino
- 27.8%2024 5-year
- Peak Democratic margin
- D+35.1 in 2020MIT Election Lab
- Peak Republican margin
- R+36.8 in 1924MIT Election Lab
- Most similar
- State Senate District 22, CT · twin score 93.6
presidential history
Party record book
Connecticut 25th 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
Joe Biden2020
66.9%
33,288 votes · D+35.1 · modeled estimate
Runner-up · Lyndon B. Johnson, 1964 · 65.5%
Republican
Dwight D. Eisenhower1956
65.8%
18,241 votes · R+31.5 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · 61.3%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
33,288votes
66.9% of the vote · D+35.1 · modeled estimate
Runner-up · Kamala Harris, 2024 · 29,907 votes
Republican
Ronald Reagan1984
23,465votes
61.0% of the vote · R+22.5 · modeled estimate
Runner-up · Richard Nixon, 1972 · 21,287 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
+30.7pts D vs U.S.
Place D+35.1 · U.S. D+4.5 · modeled estimate
Runner-up · Kamala Harris, 2024 · +28.9 pts
Republican
Dwight D. Eisenhower1956
+16.1pts R vs U.S.
Place R+31.5 · U.S. R+15.4 · modeled estimate
Runner-up · Herbert Hoover, 1932 · +13.8 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 | D | 61.7%27,536 | 38.3%17,114 | 44,650 |
| 2018 | D | 61.4%22,365 | 38.6%14,056 | 36,421 |
In 2024 it voted Democratic by D+27.4, against D+27.7 in 2008. Median household income was $113,277 in the 2024 ACS 5-year, among the higher figures for a state senate district.
Across the recorded series it reached a Democratic high of 35.1 points in 2020 and a Republican high of 36.8 points in 1924. Between 2020 and 2024 the district moved 7.7 points toward the Republican candidate; the 2024 margin was 27.4 points.
A population of 101,594, a 52% non-Hispanic-white share, and a median household income of $113,050 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 22 and State Senate District 27.
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 →
Connecticut 25th State Senate District. Akashic. https://akashic.app/sld-upper/09025/. Accessed May 20, 2026. License: CC BY 4.0.