- Lead
- 2,135
- Total
- 33,067
- vs nation
- D+7.9
Connecticut 15th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 5,249
- Total
- 34,614
- vs nation
- D+10.7
- Lead
- 4,542
- Total
- 32,038
- vs nation
- D+12.1
- Lead
- 7,443
- Total
- 30,631
- vs nation
- D+20.4
- Lead
- 8,181
- Total
- 32,367
- vs nation
- D+18.0
- Lead
- 3,890
- Total
- 30,763
- vs nation
- D+15.1
- Lead
- 6,903
- Total
- 28,640
- vs nation
- D+23.6
- Lead
- 6,543
- Total
- 27,237
- vs nation
- D+15.5
Key facts
- 2024 presidential margin
- D+6.5MIT Election Lab
- Population
- 104,0932024 5-year
- Population density
- 3,284 / sq mi2024 5-year · TIGER/Line
- Land area
- 31.7 sq miTIGER/Line
- Median household income
- $55,2252024 5-year
- White (non-Hispanic)
- 37.0%2024 5-year
- Black
- 18.4%2024 5-year
- Hispanic / Latino
- 37.4%2024 5-year
- Peak Democratic margin
- D+40.0 in 1964MIT Election Lab
- Peak Republican margin
- R+26.1 in 1924MIT Election Lab
- Most similar
- State Senate District 6, CT · twin score 91.6
presidential history
Party record book
Connecticut 15th 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
Lyndon B. Johnson1964
70.0%
18,911 votes · D+40.0 · modeled estimate
Runner-up · Barack Obama, 2008 · 62.3%
Republican
Dwight D. Eisenhower1956
62.1%
15,876 votes · R+24.2 · modeled estimate
Runner-up · Warren G. Harding, 1920 · 60.8%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Barack Obama2008
20,163votes
62.3% of the vote · D+25.3 · modeled estimate
Runner-up · Joe Biden, 2020 · 19,735 votes
Republican
Ronald Reagan1984
17,623votes
59.0% of the vote · R+18.3 · modeled estimate
Runner-up · Richard Nixon, 1972 · 16,636 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
Al Gore2000
+23.6pts D vs U.S.
Place D+24.1 · U.S. D+0.5 · modeled estimate
Runner-up · Al Smith, 1928 · +20.6 pts
Republican
William McKinley1896
+12.3pts R vs U.S.
Place R+18.4 · U.S. R+6.1 · modeled estimate
Runner-up · Herbert Hoover, 1932 · +11.2 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Connecticut 15th State Senate District sits in New England. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 40.0 points in 1964 and a Republican high of 26.1 points in 1924. Between 2020 and 2024 the district moved 8.7 points toward the Republican candidate; the 2024 margin was 6.5 points.
A population of 104,093, a 37% non-Hispanic-white share, and a median household income of $55,225 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 6 and State Senate District 13.
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 15th State Senate District. Akashic. https://akashic.app/sld-upper/09015/. Accessed May 20, 2026. License: CC BY 4.0.