The 1st Illinois General Assembly, consisting of the Illinois Senate and the Illinois House of Representatives, met from October 4, 1818, to March 31, 1819, during the first two years of Shadrach Bond's governorship, at The Kaskaskia State House. The apportionment of seats in the House of Representatives was based on the provisions of the First Illinois Constitution. Political parties were not established in the State at the time.
1st Illinois General Assembly
| |
|---|---|
 | |
| Type | |
| Type | |
| Houses | Senate House of Representatives |
| Leadership | |
President of the Senate | Pierre Menard, Independent |
Speaker of the House of Representatives | John Messinger, Independent |
| Seats | 14 Senators 29 Representatives |
| Meeting place | |
 | |
| Kaskaskia, Illinois | |
It was succeeded by the 2nd Illinois General Assembly.
This list is arranged by chamber, then by county. Senators and Representatives were both allotted to counties roughly by population and elected at-large within their districts. Two counties shared one senator.