99chambers

Connecticut State Senate seat · lines in effect since 2022

Connecticut Senate District 18

A district of about 99,000 people, 37% of adults with a bachelor's degree. It votes D+6.2 relative to the nation for president.

Heather Somers (R) · since Nov 8, 2016Flipped 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+6.227th most
Democratic
Most DemocraticMost Republican19th seat · the majority lineDistrict 18

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 SenateR+12.6R+18.1D+5.0

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 18.

Adults with a bachelor's degree37% 34th pct · 24th of 36 in CT

Lower than 66% of seats.

White adults without a degree53% 97th pct · 2nd of 36 in CT

Higher than 97% of seats.

Hispanic residents8% 9th pct · 33rd of 36 in CT

Lower than 91% of seats.

Black residents3% 17th pct · 30th of 36 in CT

Lower than 83% of seats.

Asian residents4% 34th pct · 24th of 36 in CT

Lower than 66% of seats.

People per square mile302 9th pct · 33rd of 36 in CT

Less dense than 91% 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. 2 of the 4 flipped this year.

District 35
41% college gradsD+4.4Flipped DDistrict 19
31% college gradsD+7.6Held DDistrict 29
29% college gradsD+4.7Held 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. Joe de la Cruz (D)
    2027– · Won 2026 by 5.0
  2. Heather Somers (R)
    2023–2027 · Won 2022 by 12.6, 2024 by 18.1

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