Illinois State Senate seat · lines in effect since 2022
Illinois Legislative District 40
A district of about 200,000 people, 26% Black, 25% of adults with a bachelor's degree. It votes D+0.6 relative to the nation for president.
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.
Democratic
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 | |
|---|---|---|---|
| U.S. Senate | D+0.4 | No race | R+8.3 |
| Governor | No race | R+4.7 | No 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 40.
Lower than 81% of seats.
Higher than 67% of seats.
Lower than 53% of seats.
Higher than 83% of seats.
Lower than 91% of seats.
Less dense than 76% 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 5730% Black · 30% college gradsD+11.6Held DDistrict 48
32% college gradsD+3.9Held DDistrict 36
24% college gradsD+5.6Held DDistrict 56
30% college gradsR+2.3Counting
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