Since

Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...

became a U.S. state in 1818, it has sent congressional delegations to the

United States Senate The United States Senate is the upper chamber of the United States Congress, with the House of Representatives being the lower chamber. Together they compose the national bicameral legislature of the United States. The composition and pow ...

and

United States House of Representatives The United States House of Representatives, often referred to as the House of Representatives, the U.S. House, or simply the House, is the Lower house, lower chamber of the United States Congress, with the United States Senate, Senate being ...

. Each state elects two senators to serve for six years, and members of the House to two-year terms. Before becoming a state, the

Illinois Territory The Territory of Illinois was an organized incorporated territory of the United States that existed from March 1, 1809, until December 3, 1818, when the southern portion of the territory was admitted to the Union as the State of Illinois. Its ...

elected a non-voting delegate at-large to Congress from 1812 to 1818. These are tables of congressional delegations from Illinois to the United States Senate and the United States House of Representatives.

Current delegation

Illinois's current congressional delegation in the consists of its two senators, both of whom are Democrats, and its 17 representatives: 14 Democrats and 3 Republicans. The current dean of the Illinois delegation is Senator

Dick Durbin Richard Joseph Durbin (born November 21, 1944) is an American lawyer and politician serving as the senior United States senator from Illinois, a seat he has held since 1997. A member of the Democratic Party, Durbin has served as the Senate Dem ...

, having served in the Senate since 1997 and in Congress since 1983.

United States Senate

United States House of Representatives

1812–1818: 1 non-voting delegate

Starting on December 3, 1812,

sent a non-voting delegate to the House. Part of the area of

became the State of

on December 3, 1818.

1818–1833: 1 seat

Following statehood on December 3, 1818, Illinois had one seat in the House.

1833–1843: 3 seats

Following the 1830 census, Illinois was apportioned three seats, all elected via

single member districts A single-member district is an electoral district represented by a single officeholder. It contrasts with a multi-member district, which is represented by multiple officeholders. Single-member districts are also sometimes called single-winner vo ...

1843–1853: 7 seats

Following the 1840 census, Illinois was apportioned seven seats.

1853–1863: 9 seats

Following the 1850 census, Illinois was apportioned nine seats.

1863–1873: 14 seats

Following the 1860 census, Illinois was apportioned 14 seats, 13 of which were elected from

and 1 elected at-large statewide.

1873–1883: 19 seats

Following the 1870 census, Illinois was apportioned 19 seats, all elected via

1883–1895: 20 seats

Following the 1860 census, Illinois was apportioned 20 seats.

1893–1903: 22 seats

Following the 1890 census, Illinois was apportioned 22 seats. Until 1895, 20 seats were elected from

and 2 were elected at-large statewide. In 1895, Illinois redistricted all of its seats.

1903–1913: 25 seats

Following the 1900 census, Illinois was apportioned 25 seats.

1913–1943: 27 seats

Following the 1910 census, Illinois was apportioned 27 seats, 25 of which were elected from

and 2 were elected at-large statewide.

1943–1953: 26 seats

Following the 1940 census, Illinois was apportioned 26 seats. Until 1949, 25 seats were elected from

and 1 was elected at-large statewide. From 1949, all 26 seats were redistricted.

1953–1963: 25 seats

Following the 1950 census, Illinois was apportioned 25 seats, all of which were elected from single-member districts.

1963–1983: 24 seats

Following the 1960 census, Illinois was apportioned 24 seats.

1983–1993: 22 seats

Following the 1980 census, Illinois was apportioned 22 seats.

1993–2003: 20 seats

Following the 1990 census, Illinois was apportioned 20 seats.

2003–2013: 19 seats

Following the 2000 census, Illinois was apportioned 19 seats.

2013–2023: 18 seats

Following the 2010 census, Illinois was apportioned 18 seats.

From 2023-Present: 17 seats

Following the 2020 census, Illinois was apportioned 17 seats.

Key

Notes

References

{{U.S. congressional delegations

Politics of Illinois Congressional delegations