99chambers

Connecticut House of Representatives seat · lines in effect since 2022

Connecticut House District 21

A district of about 21,000 people, 68% of adults with a bachelor's degree. It votes D+20.5 relative to the nation for president.

Mike Demicco (D) · since Nov 6, 2012Next election Nov 7, 2028The 2026 race →

Where it sits among all 151 seats

Every Connecticut House of Representatives 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+20.572nd most
Democratic
Most DemocraticMost Republican76th 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.

202220242026
Connecticut House of RepresentativesD+9.7D+29.6D+31.5

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 151 seats. Small marks are other seats in Connecticut. The black marker is District 21.

Adults with a bachelor's degree68% 91st pct · 14th of 151 in CT

Higher than 91% of seats.

White adults without a degree26% 31st pct · 104th of 151 in CT

Lower than 69% of seats.

Hispanic residents7% 23rd pct · 117th of 151 in CT

Lower than 77% of seats.

Black residents3% 27th pct · 111th of 151 in CT

Lower than 73% of seats.

Asian residents13% 99th pct · 3rd of 151 in CT

Higher than 99% of seats.

People per square mile854 37th pct · 95th of 151 in CT

Less dense 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.

District 31
66% college gradsD+25.5Held DDistrict 17
66% college gradsD+20.4Held DDistrict 151
72% college gradsD+18.5Held DDistrict 114
57% college gradsD+21.1Held D

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. Mike Demicco (D)
    2023– · Won 2022 by 9.7, 2024 by 29.6, 2026 by 31.5

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