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 representation
Current officeholders
DJoan HartleyState Senate · 15
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.
Akashic
Political twins — state-senate districts
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.
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons → · Or open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Connecticut 15th State Senate District. Akashic. https://akashic.app/sld-upper/09015/. Accessed May 20, 2026. License: CC BY 4.0.
How did Connecticut 15th State Senate District vote in 2024?
In 2024, Connecticut 15th State Senate District voted Democratic by 6.5 points (D+6.5), carried by the Democratic candidate. Out of 33,067 votes cast, 17,404 went Democratic and 15,269 went Republican.
When did Connecticut 15th State Senate District last vote Republican?
The most recent presidential election in which Connecticut 15th State Senate District voted Republican was 1988.
How many people live in Connecticut 15th State Senate District?
Connecticut 15th State Senate District has a population of 104,093 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Connecticut 15th State Senate District?
Median household income in Connecticut 15th State Senate District is $55,225 — below the national median of $80,734. The Connecticut state median is $95,781.
What is the political history of Connecticut 15th State Senate District?
Akashic tracks 38 presidential elections in Connecticut 15th State Senate District from 1876 to 2024. Of those, 25 went Democratic and 13 went Republican.