United States House of Representatives elections, 1998 Illinois Illinois

| District | Incumbent | Party | First_elected | Results | Candidates |
|---|---|---|---|---|---|
| Illinois 12 | Jerry Costello | Democratic | 1988 | Re-elected | Jerry Costello (D) 60.4% William Price (R) 39.6% |
| Illinois 13 | Harris Fawell | Republican | 1984 | Retired Republican hold | Judy Biggert (R) 61% Susan Hynes (D) 39% |
| Illinois 14 | Dennis Hastert | Republican | 1986 | Re-elected | Dennis Hastert (R) 69.8% Robert Cozzi (D) 30.2% |
| Illinois 15 | Thomas Ewing | Republican | 1991 | Re-elected | Thomas Ewing (R) 61.6% Laurel Prussing (D) 38.4% |
| Illinois 16 | Donald A. Manzullo | Republican | 1992 | Re-elected | Donald A. Manzullo (R) unopposed |
| Illinois 17 | Lane Evans | Democratic | 1982 | Re-elected | Lane Evans (D) 51.6% Mark Baker (R) 48.4% |
| Illinois 18 | Ray LaHood | Republican | 1994 | Re-elected | Ray LaHood (R) unopposed |
| Illinois 19 | Glenn Poshard | Democratic | 1988 | Retired to run for Governor Democratic hold | David D. Phelps (D) 58.3% Brent Winters (R) 41.7% |