Illinois Legislature
Illinois State Senate
59 seats: Democratic 40, Republican 19. A majority is 30. 59 districts.
Seats by party
Illinois State Senate
Seats before the November 3, 2026 election
30 needed for a majority
- 40 Democratic
- 19 Republican
| Party or status | Seats |
|---|---|
| Democratic | 40 |
| Republican | 19 |
Seats before the November 3, 2026 election, current to November 2, 2026, counted from the official member list. Source: Illinois State Senate (opens in a new tab).
Illinois State Senate districts map
Point to or tap a district for its name and a link to its page. The list below has every district.
Every district
- District 1
- District 2
- District 3
- District 4
- District 5
- District 6
- District 7
- District 8
- District 9
- District 10
- District 11
- District 12
- District 13
- District 14
- District 15
- District 16
- District 17
- District 18
- District 19
- District 20
- District 21
- District 22
- District 23
- District 24
- District 25
- District 26
- District 27
- District 28
- District 29
- District 30
- District 31
- District 32
- District 33
- District 34
- District 35
- District 36
- District 37
- District 38
- District 39
- District 40
- District 41
- District 42
- District 43
- District 44
- District 45
- District 46
- District 47
- District 48
- District 49
- District 50
- District 51
- District 52
- District 53
- District 54
- District 55
- District 56
- District 57
- District 58
- District 59
Sources and methodology
ShowHideWhere the seat counts and district lines come from.
These are the seats before the November 3, 2026 election, as the legislature listed them.
District lines come from the U.S. Census Bureau's upper chamber boundary file (Cartographic boundary files, state legislative districts), which maps the districts the state reported to the Census Bureau. Where a state has redrawn its districts since then, the state's own maps are the official ones. District names are the Census Bureau's.