| Illinois state bird? | 20 |
| Illinois state flower | 21 |
| Illinois State University site | 30 |
| Illinois test-marketing town | 28 |
| Illinois time: Abbr. | 20 |
| Illinois town | 13 |
| Illinois town near Champaign | 28 |
| Illinois town near the Mississippi River | 40 |
| Illinois town, site of the first Lincoln-Douglas debate | 55 |
| Illinois university or its city | 31 |
| Illinois village | 16 |
| Illinois's junior senator | 29 |
| Illinois's nickname | 23 |
| Illinois, "___ of Lincoln" | 36 |
| Illinois, Indiana, Iowa, Michigan, Michigan State, Minnesota, Northwestern, Ohio State, Penn State, Purdue and Wisconsin | 120 |
| Illinois, Wisconsin, etc. | 25 |
| Illinois-based brewery | 22 |
| Illinois-based equipment giant | 30 |
| Illinois-based food giant | 25 |
| Illinoisan in the news | 22 |
| Illiteracy | 10 |
| Illiterate | 10 |
| Illiterate signatory, perhaps | 29 |
| Illiterate signature | 20 |
| Illiterate signing | 18 |
| Illiterates' marks | 22 |
| Illiterates' signatures | 27 |
| Illness | 7 |
| Illness caused by eating Cheetos? | 33 |
| Illness caused by plasmodia | 27 |
| Illness found by a spot check? | 30 |
| Illness in Iberville | 20 |
| Illness indicator | 17 |
| Illness of unknown origin | 25 |
| Illness suffix | 14 |
| Illness that is a swell time? | 29 |
| Illness transmitted from Little Miss Muffet | 43 |
| Illness's end? | 18 |
| Illnesses | 9 |
| Illogical | 9 |
| Illogical person | 16 |
| Illogical, as reasoning | 23 |
| Illogically afraid | 18 |
| Illogically, not the eighth mo. | 31 |
| Ills | 4 |
| Ills in tales | 13 |
| Illum. | 6 |
| Illum. devices | 14 |
| Illuminant | 10 |
| Illuminant gas | 14 |
| Illuminant: Abbr. | 17 |
| Illuminate | 10 |
| Illuminate, with "on" | 31 |
| Illuminated | 11 |
| Illuminated like 1890s streets | 31 |
| Illuminated again | 17 |
| Illuminated by a flame | 22 |
| Illuminated from above | 22 |
| Illuminated from behind | 23 |
| Illuminated from below | 22 |
| Illuminated in a way | 20 |
| Illuminated indirectly | 22 |
| Illuminated like 1890s streets | 30 |
| Illuminated naturally | 21 |
| Illuminated notices above theater doors | 39 |
| Illuminated radio studio sign | 29 |
| Illuminated sign | 16 |
| Illuminated sign in a radio station | 35 |
| Illuminated studio sign | 23 |
| Illuminated word on a street corner | 35 |
| Illuminated, as old streets | 27 |
| Illuminated, as on stage | 24 |
| Illuminated, as Saint-Exupéry's instrument lamps | 55 |
| Illuminated, as streets of old | 30 |
| Illuminated, in a way | 21 |
| Illuminated, long ago | 21 |
| Illuminates | 11 |
| Illuminates a Halloween display? | 32 |
| Illuminates, in a way | 21 |
| Illuminati | 10 |
| Illuminati symbol | 17 |
| Illuminating | 12 |
| Illuminating gas | 16 |
| Illumination | 12 |
| Illumination aid | 16 |
| Illumination at Buckingham Palace? | 34 |
| Illumination in "The Star-Spangled Banner" | 52 |
| Illumination in a song | 22 |
| Illumination indication | 23 |
| Illumination measure | 20 |
| Illumination of a stand with many hooks? | 40 |
| Illumination of manuscripts, and others | 39 |
| Illumination source | 19 |
| Illumination unit | 17 |
| Illumination units | 18 |
| Illumination, in Bonn | 21 |
| Illuminator in a shirt pocket, perhaps | 38 |
| Illuminator on a keychain | 25 |
| Illuminators | 12 |
| Illumined | 9 |