- Lead
- 8,106
- Total
- 52,812
- vs nation
- D+16.8
Connecticut 9th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 10,856
- Total
- 53,835
- vs nation
- D+15.7
- Lead
- 6,880
- Total
- 48,482
- vs nation
- D+12.1
- Lead
- 9,072
- Total
- 46,356
- vs nation
- D+15.7
- Lead
- 12,521
- Total
- 48,640
- vs nation
- D+18.5
- Lead
- 6,882
- Total
- 46,726
- vs nation
- D+17.2
- Lead
- 8,708
- Total
- 43,382
- vs nation
- D+19.6
- Lead
- 8,671
- Total
- 41,577
- vs nation
- D+12.3
Key facts
- 2024 presidential margin
- D+15.3MIT Election Lab
- Population
- 101,2452024 5-year
- Population density
- 1,612 / sq mi2024 5-year · TIGER/Line
- Land area
- 62.8 sq miTIGER/Line
- Median household income
- $93,1432024 5-year
- White (non-Hispanic)
- 68.8%2024 5-year
- Black
- 7.4%2024 5-year
- Hispanic / Latino
- 10.3%2024 5-year
- Peak Democratic margin
- D+38.1 in 1964MIT Election Lab
- Peak Republican margin
- R+41.7 in 1896MIT Election Lab
- Most similar
- State Senate District 19, CT · twin score 94.7
presidential history
Party record book
Connecticut 9th 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
68.9%
22,567 votes · D+38.1 · modeled estimate
Runner-up · Barack Obama, 2008 · 62.1%
Republican
William McKinley1896
68.3%
3,091 votes · R+41.7 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · 65.6%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
31,914votes
59.3% of the vote · D+20.2 · modeled estimate
Runner-up · Barack Obama, 2008 · 30,195 votes
Republican
Ronald Reagan1984
24,665votes
58.6% of the vote · R+17.5 · modeled estimate
Runner-up · Richard Nixon, 1972 · 22,256 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
+19.6pts D vs U.S.
Place D+20.1 · U.S. D+0.5 · modeled estimate
Runner-up · Barack Obama, 2008 · +18.5 pts
Republican
William McKinley1896
+35.6pts R vs U.S.
Place R+41.7 · U.S. R+6.1 · modeled estimate
Runner-up · Herbert Hoover, 1932 · +25.4 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 | D | 60.8%30,174 | 39.2%19,469 | 49,643 |
| 2018 | D | 61.5%24,941 | 38.5%15,622 | 40,563 |
Connecticut 9th State Senate District sits in New England. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 38.1 points in 1964 and a Republican high of 41.7 points in 1896. Between 2020 and 2024 the district moved 4.8 points toward the Republican candidate; the 2024 margin was 15.3 points.
A population of 101,245, a 69% non-Hispanic-white share, and a median household income of $93,143 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 19 and State Senate District 20.
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 9th State Senate District. Akashic. https://akashic.app/sld-upper/09009/. Accessed May 20, 2026. License: CC BY 4.0.