99chambers

Connecticut State Senate seat · lines in effect since 2022

Connecticut Senate District 20

A district of about 96,000 people, 42% of adults with a bachelor's degree. It votes D+18.8 relative to the nation for president.

Martha Marx (D) · since Nov 8, 2022Next 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+18.815th most
Democratic
Most DemocraticMost Republican19th seat · the majority lineDistrict 20

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 State SenateD+4.5D+12.3D+18.2

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 20.

Adults with a bachelor's degree42% 51st pct · 18th of 36 in CT

Higher than 51% of seats.

White adults without a degree42% 69th pct · 12th of 36 in CT

Higher than 69% of seats.

Hispanic residents15% 54th pct · 17th of 36 in CT

Higher than 54% of seats.

Black residents5% 34th pct · 24th of 36 in CT

Lower than 66% of seats.

Asian residents3% 26th pct · 27th of 36 in CT

Lower than 74% of seats.

People per square mile435 23rd pct · 28th of 36 in CT

Less dense than 77% 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 12
54% college gradsD+13.7Held DDistrict 33
46% college gradsD+10.2Held DDistrict 19
31% college gradsD+7.6Held DDistrict 7
38% college gradsD+4.6Flipped 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. Martha Marx (D)
    2023– · Won 2022 by 4.5, 2024 by 12.3, 2026 by 18.2

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