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Connecticut State Senate District 21

Connecticut State Senate District 21

Connecticut · Latest: 2024↓ R+13.4 vs 2020

Competitive — shifted 13.4pp toward Republicans in 2024 — 103K residents

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Connecticut State Senate District 21 is a state senate district that has a population of 103,132. In the 2024 presidential election, it voted Democratic with a margin of D+0.8. Akashic Edge tracks 5 presidential elections here, dating back to 2008.

Connecticut State Senate District 21 Presidential Election Results, 2008–2024
YearDem %Rep %MarginSwing
202449.8%48.9%D+0.8R+13.4
2020*56.5%42.2%D+14.3D+22.5
2016*43.9%52.1%R+8.2R+7.0
2012*49.4%50.6%R+1.3R+2.9
2008*50.2%48.5%D+1.7—

* Pre-2022 results projected onto current district boundaries. Actual boundaries at the time of the election may have differed.

Political Identity

What defines CT-SD-21?

CT-SD-21 has been won by both parties in the last 5 presidential elections (3D, 2R) — a genuine swing geography. It has a working-class electorate (0% college-educated) — a demographic increasingly aligned with Republicans nationwide.

Similarity Explorer

Similar state senate districts

Nearest neighbors matched on the same place-page feature set used across the dossier system.
8 visible matches
Historian Query

Ask the Historian

Explore CT-SD-21's political evolution with the Historian
Automated Readout

Key Insights

High-confidence patterns distilled from this geography's election history.
  • The 2024 election was decided by just 0.8 points — razor-thin
  • Swung 13.4 points toward Republican between 2020 and 2024
  • Won by both parties in recent history — Democrats most recently in 2024, Republicans in 2016
Race & Ancestry

Who Lives Here

A race-first Census view with ancestry expansion where source coverage is strong enough to support detail.
CT-SD-21Census ACS 2024
Census race profile
Major Census race and ethnicity groups shown as a share of total population.
Expand rows for ancestry detail
White (Non-Hispanic) 71.2%Hispanic 13.5%Black 8.4%Asian 3.4%Multiracial 3.2%
GroupCT-SD-21StateNational
White (Non-Hispanic)
71.2%63.2%57.4%
Hispanic / Latino
13.5%17.3%19.3%
Black / African American
8.4%10.8%12.2%
Asian
3.4%4.8%6.0%
Multiracial / Other
3.2%3.5%4.0%
Native American / Alaska Native
0.2%0.4%0.9%
Method notes

Census treats race and Hispanic/Latino origin as separate questions. Race categories other than Hispanic reflect total populations (small Hispanic overlap in Black, Asian, AIAN, NHPI). “Multiracial / Other” is derived as a non-overlapping remainder.

Detailed ancestry data unavailable for this geography.

Who lives in Connecticut State Senate District 21? 103,132 residents as of the 2020 Census.

Demographic Comparison

Demographics

Read this geography's profile in three layers: local, state (where available), and national baseline.
CT-SD-21 vs Connecticut vs National103K residents
Population & electorate

Scale, voting-age share, and this geography's footprint inside the national electorate.

Total population
Local vs state vs U.S.
103K
local
103KState 3.6MNational 334.9M
Share of U.S. population
Local vs state vs U.S.
0.03%
local
0.03%National 100%
Voting-age population
Local vs state vs U.S.
81.3%
local
81.3%State 79.6%National 75.7%
Economic profile

Income, attainment, and ownership indicators that often shape coalition structure and turnout behavior.

Median household income
Local vs state vs U.S.
N/A
local
N/AState $105,287National $83,960
Poverty rate
Local vs state vs U.S.
N/A
local
N/AState 10.0%National 12.5%
College degree
Local vs state vs U.S.
N/A
local
N/AState 42.5%National 35.6%
Homeownership
Local vs state vs U.S.
N/A
local
N/AState 66.5%National 65.2%
Community profile

Age structure, language use, and nativity signals that explain how this geography differs from state and nation.

Median age
Local vs state vs U.S.
N/A
local
N/AState 41.5 yrsNational 39.1 yrs
Age 18–29
Local vs state vs U.S.
N/A
local
N/ANational 15.7%
Age 65+
Local vs state vs U.S.
N/A
local
N/ANational 17.0%
Foreign born
Local vs state vs U.S.
N/A
local
N/AState 15.8%National 14.1%
Non-English at home
Local vs state vs U.S.
N/A
local
N/AState N/ANational 22.2%
English only
Local vs state vs U.S.
N/A
local
N/AState N/ANational 77.8%
Voter Turnout

Turnout in CT-SD-21

Estimated using 2020 Census voting-age population.
2024 Turnout
67.9%
vs Previous
-64.3pp
Voting-Age Pop
83,872
History
2008–2024
Competitiveness

How competitive is CT-SD-21?

Tilt DAvg margin: D+2.3 (last 3 elections)
2008
D+1.7
2012
R+1.3
2016
R+8.2
2020
D+14.3
2024
D+0.8
Elasticity
22.5pp
margin range
Party Flips
2
last 30 years
5-Elec Avg
D+1.5

Other Connecticut State Senate Districts

35 total
NameMargin ↓
CT-SD-02D+59.3
CT-SD-11D+56.6
CT-SD-10D+48.4
CT-SD-01D+42.8
CT-SD-23D+42.2
CT-SD-05D+37.7
CT-SD-26D+33.3
CT-SD-25D+27.4
CT-SD-04D+26.2
CT-SD-27D+26.1
CT-SD-03D+22.2
CT-SD-22D+18.9
CT-SD-28D+18.5
CT-SD-20D+18.1
CT-SD-36D+17.5
CT-SD-09D+15.4
CT-SD-13D+15.0
CT-SD-17D+13.9
CT-SD-12D+13.8
CT-SD-06D+12.2
CT-SD-08D+9.7
CT-SD-33D+9.4
CT-SD-24D+8.2
CT-SD-15D+6.5
CT-SD-19D+6.4
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