Columns: District | Incumbent | Party | First elected | Result | Candidates
Illinois 1 | Ralph H. Metcalfe | Democratic | 1970 | Re-elected | Ralph H. Metcalfe (D) 91.4% Louis Coggs (R) 8.6% | Illinois 4 | Ed Derwinski | Republican | 1958 | Re-elected | Ed Derwinski (R) 70.5% C. F. 'Bob' Dore (D) 29.5% | Illinois 10 | Abner J. Mikva Redistricted from the 2nd district | Democratic | 1968 | Lost re-election Republican gain | Samuel H. Young (R) 51.6% Abner J. Mikva (D) 48.4% | Illinois 11 | Frank Annunzio Redistricted from the 7th district | Democratic | 1964 | Re-elected | Frank Annunzio (D) 53.3% John J. Hoellen (R) 46.7% | Illinois 11 | Roman C. Pucinski | Democratic | 1958 | Retired to run for U.S. Senate Democratic loss | Frank Annunzio (D) 53.3% John J. Hoellen (R) 46.7% | Illinois 12 | Phil Crane Redistricted from the 13th district | Republican | 1969 | Re-elected | Phil Crane (R) 74.2% Edwin L. Frank (D) 25.8% | Illinois 15 | Cliffard D. Carlson | Republican | April 4, 1972 (Special) | Retired Republican loss | Leslie C. Arends (R) 57.2% Tim L. Hall (D) 42.8% | Illinois 19 | Tom Railsback | Republican | 1966 | Re-elected | Tom Railsback (R) Unopposed | Illinois 20 | Paul Findley | Republican | 1960 | Re-elected | Paul Findley (R) 68.8% Robert S. O'Shea (D) 31.2%