Illinois House of Representatives seat · lines in effect since 2022
Illinois Representative District 55
A district of about 110,000 people, 49% of adults with a bachelor's degree. It votes D+9.4 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.
| 2022 | 2026 | |
|---|---|---|
| Illinois House of Representatives | D+8.8 | D+29.6 |
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 55.
Higher than 75% of seats.
Lower than 51% of seats.
Higher than 50% of seats.
Lower than 78% of seats.
Higher than 92% of seats.
Denser than 79% 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 5350% college gradsD+16.4Held DDistrict 56
21% Hispanic · 41% college gradsD+13.7Held DDistrict 45
60% college gradsD+14.1Held DDistrict 97
48% college gradsD+6.0Held 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.
- Justin Cochran (D)
2027– · Won 2026 by 29.6 - Martin J. Moylan (D)
2023–2027 · Won 2022 by 8.8, 2024 unopposed
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)