99chambers

Illinois State Senate seat · lines in effect since 2022

Illinois Legislative District 51

A district of about 226,000 people, 25% of adults with a bachelor's degree. It votes R+45.1 relative to the nation for president.

Chapin Rose (R) · 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.

R+45.156th most
Democratic
Most DemocraticMost Republican30th seat · the majority lineDistrict 51

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.

201620182020
U.S. SenateR+36.0No raceR+37.0
GovernorNo raceR+31.5No race

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 51.

Adults with a bachelor's degree25% 21st pct · 47th of 59 in IL

Lower than 79% of seats.

White adults without a degree69% 95th pct · 4th of 59 in IL

Higher than 95% of seats.

Hispanic residents4% 14th pct · 51st of 59 in IL

Lower than 86% of seats.

Black residents2% 9th pct · 54th of 59 in IL

Lower than 91% of seats.

Asian residents1% 10th pct · 53rd of 59 in IL

Lower than 90% of seats.

People per square mile44 5th pct · 56th of 59 in IL

Less dense than 95% 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 50
24% college gradsR+45.8Held RDistrict 54
25% college gradsR+45.1Held RDistrict 55
25% college gradsR+47.4Not up in 2026District 58
21% college gradsR+49.9Not 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. Chapin Rose (R)
    2023– · Won 2022 unopposed, 2026 unopposed

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