Illinois House of Representatives seat · lines in effect since 2022
Illinois Representative District 78
A district of about 105,000 people, 24% Black, 56% of adults with a bachelor's degree. It votes D+68.3 relative to the nation for president.
Where it sits among all 118 seats
Every Illinois House of Representatives 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.
| 2026 | |
|---|---|
| Illinois House of Representatives | D+76.7 |
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 118 seats. Small marks are other seats in Illinois. The black marker is District 78.
Higher than 85% of seats.
Lower than 84% of seats.
Higher than 65% of seats.
Higher than 80% of seats.
Higher than 55% of seats.
Denser 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 1037% Black · 57% college gradsD+72.4Held DDistrict 14
56% college gradsD+78.1Held DDistrict 13
66% college gradsD+78.2Held DDistrict 18
73% college gradsD+69.2Held 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.
- Camille Lilly (D)
2023– · Won 2022 unopposed, 2024 unopposed, 2026 by 76.7
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)