99chambers

Illinois State Senate seat · lines in effect since 2022

Illinois Legislative District 18

A district of about 212,000 people, 37% of adults with a bachelor's degree. It votes D+10.2 relative to the nation for president.

Bill Cunningham (D) · since Nov 6, 2012Next election Nov 5, 2030The 2026 race →

Where it sits among all 59 seats

Every Illinois 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+10.236th most
Democratic
Most DemocraticMost Republican30th 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.

20222026
Illinois State SenateD+18.7D+33.8

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

Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 7, 2026, 3:01 PM ET

Who lives here, compared

Grey bars show the spread of all 59 seats. Small marks are other seats in Illinois. The black marker is District 18.

Adults with a bachelor's degree37% 53rd pct · 28th of 59 in IL

Higher than 53% of seats.

White adults without a degree39% 64th pct · 22nd of 59 in IL

Higher than 64% of seats.

Hispanic residents15% 53rd pct · 28th of 59 in IL

Higher than 53% of seats.

Black residents17% 78th pct · 14th of 59 in IL

Higher than 78% of seats.

Asian residents2% 31st pct · 41st of 59 in IL

Lower than 69% of seats.

People per square mile3,236 62nd pct · 23rd of 59 in IL

Denser than 62% 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 19
28% Black · 41% college gradsD+10.1Not up in 2026District 46
34% college gradsD+16.2Not up in 2026District 34
21% Hispanic · 22% college gradsD+12.6Not up in 2026District 48
32% college gradsD+3.9Held 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. Democratic (D)
    2027– · Won 2026 by 33.8
  2. Bill Cunningham (D)
    2023–2027 · Won 2022 by 18.7

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