Illinois State Senate seat · lines in effect since 2022
Illinois Legislative District 15
A district of about 228,000 people, 49% Black, 25% of adults with a bachelor's degree. It votes D+50.2 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 | R+8.5 | No race | R+13.8 |
| Governor | No race | R+15.0 | 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 15.
Lower than 78% of seats.
Lower than 71% of seats.
Higher than 57% of seats.
Higher than 98% of seats.
Lower than 81% of seats.
Less dense than 66% 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 1446% Black · 30% college gradsD+41.0Held DDistrict 4
23% Hispanic · 45% BlackD+56.4Not up in 2026District 16
27% Hispanic · 46% BlackD+50.2Not up in 2026District 17
66% Black · 26% college gradsD+62.6Held 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.
- Napoleon Harris (D)
2027– · Won 2026 unopposed - Napoleon B. Harris III (D)
2023–2027 · Won 2022 by 96.5
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)