State legislature

Illinois Legislature

Democratic members hold a majority in the Illinois State Senate. Democratic members hold a majority in the Illinois House of Representatives. Seats as of the legislature's member list before the November 3, 2026 election.

Illinois State Senate

Seats before the November 3, 2026 election

30 needed for a majority

40 Democratic
19 Republican

Illinois State Senate seats before the November 3, 2026 election
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).

All 59 Senate districts, with a map

Illinois House of Representatives

Seats before the November 3, 2026 election

60 needed for a majority

78 Democratic
40 Republican

Illinois House of Representatives seats before the November 3, 2026 election
Party or status	Seats
Democratic	78
Republican	40

Seats before the November 3, 2026 election, current to November 2, 2026, counted from the official member list. Source: Illinois House of Representatives (opens in a new tab).

All 118 House districts, with a map

Sources and methodology

ShowWhere the seat counts and district lines come from.

Illinois State Senate: These are the seats before the November 3, 2026 election, as the legislature listed them. Illinois State Senate current member list (opens in a new tab)

Illinois House of Representatives: These are the seats before the November 3, 2026 election, as the legislature listed them. Illinois House of Representatives current member list (opens in a new tab)

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.