This is one of our least certain forecasts — state-legislative races have almost no district polling and many of these maps were redrawn. Read the range, not the midpoint. How this is modeled →
Democrats are favored to hold control of the Illinois Senate.
59 seats, one per district. Hover a district for its seat; the table below opens with the closest races and carries the exact values.
Census Bureau 2025 1:500,000 cartographic boundaries — simplified geometry for thematic mapping, not legal district lines.
| Democrat | Republican | ||||
|---|---|---|---|---|---|
| 56 | Modeled D-vs-R | Republican — 58 in 100 | KEVIN HALL · MARSIA GELDERT-MURPHEY | ERICA HARRISS | |
| 33 | Modeled D-vs-R | MICHELE CLARK — 60 in 100 | MICHELE CLARK | JESSICA BREUGELMANS · DANIELLE PENMAN | |
| 24 | Modeled D-vs-R | BENJAMIN "BEN" McADAMS — 63 in 100 | BENJAMIN "BEN" McADAMS | SETH LEWIS | |
| 48 | Modeled D-vs-R | DORIS TURNER — 65 in 100 | DORIS TURNER | FRANK LESKO | |
| 36 | Modeled D-vs-R | MICHAEL W. HALPIN — 69 in 100 | MICHAEL W. HALPIN | BRAD BEEKMAN · PATRICK HARLAN | |
| 32 | Modeled D-vs-R | CRAIG WILCOX — 74 in 100 | KAREN BATTAGLIA | CRAIG WILCOX | |
| 38 | Modeled D-vs-R | SUE REZIN — 78 in 100 | ERNIE R. MARCELAIN | SUE REZIN | |
| 41 | Modeled D-vs-R | Democratic — 79 in 100 | — | JOHN CURRAN | |
| 18 | Modeled D-vs-R | FRANCES ANN HURLEY — 81 in 100 | FRANCES ANN HURLEY | CHRISTINE McGOVERN | |
| 26 | Modeled D-vs-R | NABEELA SYED — 82 in 100 | NABEELA SYED | DARBY HILLS |