99chambers

Illinois State Senate seat · lines in effect since 2022

Illinois Legislative District 33

A district of about 207,000 people, 46% of adults with a bachelor's degree. It votes D+3.4 relative to the nation for president.

Don DeWitte (R) · since Nov 6, 2018Flipped in 2026Next 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+3.443rd most
Democratic
Most DemocraticMost Republican30th seat · the majority lineDistrict 33

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.

2016201820202026
U.S. SenateR+15.8No raceR+2.6No race
GovernorNo raceD+0.2No raceNo race
Illinois State SenateNo raceNo raceNo raceD+16.2

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 33.

Adults with a bachelor's degree46% 74th pct · 16th of 59 in IL

Higher than 74% of seats.

White adults without a degree38% 62nd pct · 23rd of 59 in IL

Higher than 62% of seats.

Hispanic residents17% 64th pct · 22nd of 59 in IL

Higher than 64% of seats.

Black residents3% 16th pct · 50th of 59 in IL

Lower than 84% of seats.

Asian residents6% 59th pct · 25th of 59 in IL

Higher than 59% of seats.

People per square mile1,137 41st pct · 35th of 59 in IL

Less dense than 59% 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 24
51% college gradsD+4.5Flipped DDistrict 49
43% college gradsD+11.6Not up in 2026District 41
55% college gradsD+8.6Held RDistrict 10
26% Hispanic · 40% college gradsD+12.1Not up in 2026

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 16.2
  2. Donald P. Dewitte (R)
    2023–2027 · Won 2022 unopposed

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