99chambers

Connecticut State Senate seat · lines in effect since 2022

Connecticut Senate District 21

A district of about 110,000 people, 42% of adults with a bachelor's degree. It votes D+1.5 relative to the nation for president.

Jason Perillo (R) · since Feb 25, 2025Flipped in 2026Next election Nov 7, 2028The 2026 race →

Where it sits among all 36 seats

Every Connecticut State Senate seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.

D+1.531st most
Democratic
Most DemocraticMost Republican19th seat · the majority lineDistrict 21

Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET

Every race on these lines

Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.

20222026
Connecticut State SenateR+14.6D+1.7

Outlined: the race for this seat itselfBlank: no race that year

Source: 99chambers results archive: precinct results allocated to current lines; 2026: Connecticut Secretary of the StateUpdated Nov 7, 2026, 3:01 PM ET

Who lives here, compared

Grey bars show the spread of all 36 seats. Small marks are other seats in Connecticut. The black marker is District 21.

Adults with a bachelor's degree42% 54th pct · 17th of 36 in CT

Higher than 54% of seats.

White adults without a degree41% 66th pct · 13th of 36 in CT

Higher than 66% of seats.

Hispanic residents16% 57th pct · 16th of 36 in CT

Higher than 57% of seats.

Black residents7% 54th pct · 17th of 36 in CT

Higher than 54% of seats.

Asian residents5% 74th pct · 10th of 36 in CT

Higher than 74% of seats.

People per square mile1,450 63rd pct · 14th of 36 in CT

Denser than 63% of seats.

Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET

Seats most like this one

Nearest seats on demographics, density and lean. 1 of the 4 flipped this year.

District 14
47% college gradsD+6.8Held DDistrict 34
38% college gradsR+2.8Flipped DDistrict 16
37% college gradsR+8.3Held RDistrict 31
31% college gradsR+7.2Held R

Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET

Who has held it

These lines took effect in 2022.

  1. Carolann Reid (D)
    2027– · Won 2026 by 1.7
  2. Jason Perillo (R)
    2026–2027 · Won 2025 by 7.0
  3. Kevin C. Kelly (R)
    2023–2026 · Won 2022 by 14.6, 2024 unopposed

Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)