Illinois State Senate seat · lines in effect since 2022

Illinois Legislative District 45

A district of about 227,000 people, 25% of adults with a bachelor's degree. It votes R+21.5 relative to the nation for president.

Andrew Chesney (R) · since Nov 8, 2022Next 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+21.550th most
Democratic

Most DemocraticMost Republican30th seat · the majority lineDistrict 45

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.

	2016	2018	2020	2022	2026
U.S. Senate	R+22.3	No race	R+18.9	No race	No race
Governor	No race	R+18.2	No race	No race	No race
Illinois State Senate	No race	No race	No race	R+32.9	R+20.0

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 45.

Adults with a bachelor's degree25% 26th pct · 44th of 59 in IL

19%84%

Lower than 74% of seats.

White adults without a degree64% 86th pct · 9th of 59 in IL

4%71%

Higher than 86% of seats.

Hispanic residents8% 24th pct · 45th of 59 in IL

2%73%

Lower than 76% of seats.

Black residents3% 22nd pct · 46th of 59 in IL

2%66%

Lower than 78% of seats.

Asian residents1% 16th pct · 50th of 59 in IL

1%24%

Lower than 84% of seats.

People per square mile78 17th pct · 49th of 59 in IL

4129K

Less dense than 83% 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 37
27% college gradsR+19.4Not up in 2026 District 47
24% college gradsR+30.9Held R District 53
26% college gradsR+35.4Held R District 44
34% college gradsR+29.0Held R

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.

Andrew S. Chesney (R)
2023– · Won 2022 by 32.9, 2026 by 20.0

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