Akashic
1892–2024
Akashic
Connecticut 21st State Senate District
presidential margin
2008D+1.22012R+1.32016R+8.22020D+3.72024D+0.8
full record · 2008 → 2024
D+0.8
2024
median income$113,541U.S. $80,734 · CT $95,781
median age45.1U.S. 39.1 · CT 41.2
poverty rate5.7%U.S. 12.5% · CT 10.0%
bachelor’s+ (25+)48.9%U.S. 35.6% · CT 42.5%
non-english30.1%U.S. 22.3% · CT 23.4%
race · ethnicity · ancestry
Italian19.8%
Irish17.2%
English10.1%
Puerto Rican3.6%
Ecuadorian1.5%
Dominican1.5%
African American†4.8%
Jamaican1.5%
Haitian1.0%
Asian Indian1.1%
Chinese0.8%
Filipino0.3%
religion

Religious adherence is published only at the county level (U.S. Religion Census). See Greater Bridgeport Planning Region.

American Community Survey 2024 5-year (income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024.

Connecticut 21st State Senate District

Akashic
Connecticut 21st State Senate DistrictHarrisD+0.8
2024
2024 presidential margin for Connecticut 21st State Senate DistrictThe boundary of Connecticut 21st State Senate District, filled by its 2024 presidential margin (D+0.8), over faint outlines of the counties it is drawn from.Connecticut 21st State Senate District · D+0.8
How it voted
Share of the 2024 vote
Kamala Harris ✓Democratic49.8%28,341
Donald TrumpRepublican48.9%27,872
Jill SteinGreen1.3%744
D+60
R+60
District boundary, filled by its own 2024 D-vs-R margin — precinct detail where available, over the 4 counties it's drawn from (shown faint).
The precinct map shows the 2024 presidential vote; the timeline scrubs the district’s overall result across 1892–2024, on its current boundaries.
County-level results (4 counties) — table
2024 presidential result by county for Connecticut 21st State Senate District — winner and D-vs-R margin.
CountyWinnerMargin
Greater Bridgeport Planning Region, CTDemocraticD+19.6
Naugatuck Valley Planning Region, CTDemocraticD+11.2
South Central Connecticut Planning Region, CTDemocraticD+11.9
Western Connecticut Planning Region, CTDemocraticD+18.0
5 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonDemocraticRepublicanOtherMarginTotal
D
49.8%Harris28,341
48.9%Trump27,872
1.3%Stein744
+0.8%
56,957
D
51.3%Biden30,740
47.5%Trump28,494
1.2%Jorgensen743
+3.7%
59,977
R
43.9%Clinton23,347
52.1%Trump27,723
4.0%Johnson2,132
−8.2%
53,202
R
49.4%Obama18,027
50.6%Romney18,485
0.0%
−1.3%
36,512
D
50.0%Obama26,121
48.8%McCain25,489
1.2%Nader649
+1.2%
52,259
presidential history
Presidential margin, 2008–2024
Democratic minus Republican, by election
Presidential margin over timeDemocratic-minus-Republican presidential margin from 2008 to 2024. Most recent: +0.8% in 2024.flipped D · 2020+0.8%DR20082024
Presidential margin over time
YearMargin (D minus R)
2008+1.2%
2012−1.3%
2016−8.2%
2020+3.7%
2024+0.8%
DemocraticRepublican
current representation
Current officeholders
RJason PerilloState Senate · 21

State legislative officeholder from OpenStates nightly current-legislator data.

Source · OpenStates current legislator CSV.

With a 2024 presidential margin of D+19.5, this district ranks among the state's strongest for Democrats, reflecting an urban and dense suburban electorate that has voted consistently blue across federal and state races.

Across the recorded series it reached a Democratic high of 3.7 points in 2020 and a Republican high of 8.2 points in 2016. Between 2020 and 2024 the district moved 2.9 points toward the Republican candidate; the 2024 margin was 0.8 points.

A population of 103,132, a 74% non-Hispanic-white share, and a median household income of $113,541 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 30 and State Senate District 28.

Political twins — state-senate districts

The state-senate districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.

State Senate District 30
Connecticut
91.7twin score
% unaffiliatedItalian ancestrymedian income
State Senate District 28
Connecticut
88.2twin score
median income% unaffiliatedcollege share≠ 12-yr trend
State Senate District 32
Connecticut
88.0twin score
% unaffiliatedItalian ancestryelasticity≠ median income

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 →

Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Connecticut 21st State Senate District. Akashic. https://akashic.app/sld-upper/09021/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
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Places within Connecticut 21st State Senate District

counties it covers2
Greater Bridgeport Planning RegionWestern Connecticut Planning Region

Frequently asked questions

How did Connecticut 21st State Senate District vote in 2024?
In 2024, Connecticut 21st State Senate District voted Democratic by 0.8 points (D+0.8), carried by the Democratic candidate. Out of 56,957 votes cast, 28,341 went Democratic and 27,872 went Republican.
When did Connecticut 21st State Senate District last vote Republican?
The most recent presidential election in which Connecticut 21st State Senate District voted Republican was 2016.
How many people live in Connecticut 21st State Senate District?
Connecticut 21st State Senate District has a population of 103,132 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Connecticut 21st State Senate District?
Median household income in Connecticut 21st State Senate District is $113,541 — above the national median of $80,734. The Connecticut state median is $95,781.
What is the political history of Connecticut 21st State Senate District?
Akashic tracks 5 presidential elections in Connecticut 21st State Senate District from 2008 to 2024. Of those, 3 went Democratic and 2 went Republican.