- Lead
- 79,859
- Total
- 337,605
- vs nation
- D+25.1
Connecticut 4th Congressional District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 110,443
- Total
- 355,342
- vs nation
- D+26.6
- Lead
- 77,364
- Total
- 316,395
- vs nation
- D+22.4
- Lead
- 47,472
- Total
- 295,753
- vs nation
- D+12.2
- Lead
- 72,204
- Total
- 310,430
- vs nation
- D+16.0
- Lead
- 28,005
- Total
- 298,499
- vs nation
- D+11.8
- Lead
- 40,003
- Total
- 276,161
- vs nation
- D+14.0
- Lead
- 33,835
- Total
- 262,543
- vs nation
- D+4.4
Key facts
- 2024 presidential margin
- D+23.7MIT Election Lab
- Population
- 720,9682024 5-year
- Population density
- 1,621 / sq mi2024 5-year · TIGER/Line
- Land area
- 445 sq miTIGER/Line
- Median household income
- $119,4422024 5-year
- White (non-Hispanic)
- 56.9%2024 5-year
- Black
- 11.2%2024 5-year
- Hispanic / Latino
- 21.6%2024 5-year
- Peak Democratic margin
- D+31.1 in 2020MIT Election Lab
- Peak Republican margin
- R+40.7 in 1924MIT Election Lab
- Most similar
- Congressional District 5, MA · twin score 73.4
presidential history
Party record book
Connecticut 4th Congressional 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
64.8%
230,414 votes · D+31.1 · modeled estimate
Runner-up · Lyndon B. Johnson, 1964 · 63.4%
Republican
Dwight D. Eisenhower1956
67.9%
141,066 votes · R+35.7 · modeled estimate
Runner-up · Warren G. Harding, 1920 · 64.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
230,414votes
64.8% of the vote · D+31.1 · modeled estimate
Runner-up · Kamala Harris, 2024 · 206,063 votes
Republican
Ronald Reagan1984
180,474votes
63.2% of the vote · R+26.9 · modeled estimate
Runner-up · Richard Nixon, 1972 · 163,814 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
+26.6pts D vs U.S.
Place D+31.1 · U.S. D+4.5 · modeled estimate
Runner-up · Kamala Harris, 2024 · +25.1 pts
Republican
Dwight D. Eisenhower1956
+20.3pts R vs U.S.
Place R+35.7 · U.S. R+15.4 · modeled estimate
Runner-up · Herbert Hoover, 1932 · +18.3 pts
Current officeholders
Federal officeholders only. State and local officeholders are planned for the next data pass.
U.S. House
Each result reflects the U.S. House district as it was drawn for that election; redistricting has redrawn these lines over time, so they can differ from the current 120th-Congress district shown on the map above.
Stretching along Long Island Sound from Greenwich to Bridgeport, CT-04 pairs some of the wealthiest ZIP codes in the country with post-industrial urban centers, producing a consistent double-digit Democratic lean in federal contests.
Across the recorded series it reached a Democratic high of 31.1 points in 2020 and a Republican high of 40.7 points in 1924. Between 2020 and 2024 the district moved 7.4 points toward the Republican candidate; the 2024 margin was 23.7 points.
A population of 720,968, a 57% non-Hispanic-white share, and a median household income of $119,442 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 5 and Congressional District 6.
The congressional 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 4th Congressional District. Akashic. https://akashic.app/cd/0904/. Accessed May 20, 2026. License: CC BY 4.0.