United States congressional delegations from Illinois
These are tables of congressional delegations from Illinois to the United States House of Representatives and the United States Senate.
House of Representatives
Current Members
List of members of the Illinois United States House delegation, their terms in office, district boundaries, and the district political ratings according to the CPVI. The delegation has a total of 18 members, with 13 Democrats and 5 Republicans.| District | Member | Party | CPVI | Incumbent's tenure | District map |
| 1st | Bobby Rush | Democratic | D+27 | Since January 3, 1993 | |
| 2nd | Robin Kelly | Democratic | D+29 | Since April 9, 2013 | |
| 3rd | Dan Lipinski | Democratic | D+6 | Since January 3, 2005 | |
| 4th | Jesús "Chuy" García | Democratic | D+33 | Since January 3, 2019 | |
| 5th | Mike Quigley | Democratic | D+20 | Since April 7, 2009 | |
| 6th | Sean Casten | Democratic | R+2 | Since January 3, 2019 | |
| 7th | Danny K. Davis | Democratic | D+38 | Since January 3, 1997 | |
| 8th | Raja Krishnamoorthi | Democratic | D+8 | Since January 3, 2017 | |
| 9th | Jan Schakowsky | Democratic | D+18 | Since January 3, 1999 | |
| 10th | Brad Schneider | Democratic | D+10 | Since January 3, 2017 | |
| 11th | Bill Foster | Democratic | D+9 | Since January 3, 2013 | |
| 12th | Mike Bost | Republican | R+5 | Since January 3, 2015 | |
| 13th | Rodney L. Davis | Republican | R+3 | Since January 3, 2013 | |
| 14th | Lauren Underwood | Democratic | R+5 | Since January 3, 2019 | |
| 15th | John Shimkus | Republican | R+21 | Since January 3, 1997 | |
| 16th | Adam Kinzinger | Republican | R+8 | Since January 3, 2011 | |
| 17th | Cheri Bustos | Democratic | D+3 | Since January 3, 2013 | |
| 18th | Darin LaHood | Republican | R+15 | Since September 10, 2015 |
1812 – 1818: 1 Territorial delegate
The Illinois Territory was established on March 1, 1809.| Years | |
| December 3, 1812 – August 2, 1813 | Shadrach Bond |
| November 14, 1814 – March 3, 1817 | Benjamin Stephenson |
| March 4, 1817 – November 30, 1818 | Nathaniel Pope |
Part of the area of Illinois Territory became the State of Illinois on December 3, 1818.
1818 – 1833: 1 seat
From statehood in 1818, until the addition of two seats in 1833, Illinois had one Member, elected at-large statewide.| Congress | |
| 15th 1818–1819 | John McLean |
| 16th 1819–1821 | Daniel Pope Cook |
| 17th 1821–1823 | Daniel Pope Cook |
| 18th 1823–1825 | Daniel Pope Cook |
| 19th 1825–1827 | Daniel Pope Cook |
| 20th 1827–1829 | Joseph Duncan |
| 21st 1829–1831 | Joseph Duncan |
| 22nd 1831–1833 | Joseph Duncan |
1833 – 1843: 3 seats
1843 – 1853: 7 seats
1853 – 1863: 9 seats
1863 – 1873: 14 seats
1873 – 1883: 19 seats
1883 – 1895: 20, then 22 seats
Illinois gained one seat in 1881 and two more in 1891, but didn't redistrict until 1893.1895 – 1903: 22 seats
1903 – 1913: 25 seats
1913 – 1943: 27 seats
1943 – 1953: 26 seats
1953 – 1963: 25 seats
1963 – 1983: 24 seats
1983 – 1993: 22 seats
1993 – 2003: 20 seats
2003 – 2013: 19 seats
2013 – present: 18 seats
United States Senate
Senate delegation timeline (1817 – Present)
Tables showing membership in the Illinois federal Senate delegation throughout history of statehood in the United States.| Class 2 Senators | Congress | Class 3 Senators |
| Jesse B. Thomas | 15th | Ninian Edwards |
| 16th | - | - |
| 17th | - | - |
| Jesse B. Thomas | 18th | Ninian Edwards |
| John McLean | 18th | - |
| Jesse B. Thomas | 19th | Elias K. Kane |
| 20th | - | - |
| John McLean | 21st | - |
| David J. Baker | 21st | - |
| John M. Robinson | 21st | - |
| 22nd | - | - |
| 23rd | - | - |
| 24th | - | - |
| 24th | William Lee D. Ewing | - |
| John M. Robinson | 25th | Richard M. Young |
| 26th | - | - |
| Samuel McRoberts | 27th | - |
| 28th | Sidney Breese | - |
| 28th | James Semple | - |
| 29th | - | - |
| Stephen A. Douglas | 30th | - |
| 31st | James Shields | - |
| 32nd | - | - |
| 33rd | - | - |
| 34th | Lyman Trumbull | - |
| 35th | - | - |
| 36th | - | - |
| 37th | - | - |
| 37th | Orville H. Browning | - |
| 37th | William Alexander Richardson | - |
| 38th | - | - |
| Richard Yates | 39th | - |
| 40th | - | - |
| 41st | - | - |
| John A. Logan | 42nd | - |
| 43rd | Richard J. Oglesby | - |
| 44th | - | - |
| David Davis | 45th | - |
| 46th | John A. Logan | - |
| 47th | - | - |
| Shelby M. Cullom | 48th | - |
| 49th | - | - |
| 49th | Charles B. Farwell | - |
| 50th | - | - |
| 51st | - | - |
| 52nd | John M. Palmer | - |
| 53rd | - | - |
| 54th | - | - |
| 55th | William E. Mason | - |
| 56th | - | - |
| 57th | - | - |
| 58th | Albert J. Hopkins | - |
| 59th | - | - |
| 60th | - | - |
| 61st | William Lorimer | - |
| 62nd | - | - |
| J. Hamilton Lewis | 63rd | Lawrence Y. Sherman |
| 64th | - | - |
| 65th | - | - |
| Medill McCormick | 66th | - |
| 67th | William B. McKinley | - |
| 68th | - | - |
| 68th | Charles S. Deneen | - |
| 69th | - | - |
| 69th | Frank L. Smith | - |
| 70th | - | - |
| 70th | Otis F. Glenn | - |
| 71st | - | - |
| J. Hamilton Lewis | 72nd | - |
| 73rd | William H. Dieterich | - |
| 74th | - | - |
| 75th | - | - |
| 76th | Scott W. Lucas | - |
| 76th | James M. Slattery | - |
| 76th | Charles W. Brooks | - |
| 77th | - | - |
| 78th | - | - |
| 79th | - | - |
| 80th | - | - |
| Paul Douglas | 81st | - |
| 82nd | Everett Dirksen | - |
| 83rd | - | - |
| 84th | - | - |
| 85th | - | - |
| 86th | - | - |
| 87th | - | - |
| 88th | - | - |
| 89th | - | - |
| Charles H. Percy | 90th | - |
| 91st | - | - |
| 91st | Ralph Tyler Smith | - |
| 91st | Adlai Stevenson III | - |
| 92nd | - | - |
| 93rd | - | - |
| 94th | - | - |
| 95th | - | - |
| 96th | - | - |
| 97th | Alan J. Dixon | - |
| 98th | - | - |
| Paul Simon | 99th | - |
| 100th | - | - |
| 101st | - | - |
| 102nd | - | - |
| 103rd | Carol Moseley-Braun | - |
| 104th | - | - |
| Richard Durbin | 105th | - |
| 106th | Peter Fitzgerald | - |
| 107th | - | - |
| 108th | - | - |
| 109th | Barack Obama | - |
| 110th | - | - |
| 111th | Roland Burris | - |
| 111th | Mark Kirk | - |
| 112th | - | - |
| 113th | - | - |
| 114th | - | - |
| 115th | Tammy Duckworth | - |
| 116th | - | - |