| Illicit cigarette | 17 |
| Illicit dealer | 14 |
| Illicit drug | 12 |
| Illicit drug inits. | 19 |
| Illicit drugs, briefly | 22 |
| Illicit exam aid | 16 |
| Illicit gains | 13 |
| Illicit gambling, drugs, etc. | 29 |
| Illicit get-together | 20 |
| Illicit ignition | 16 |
| Illicit intermediary | 20 |
| Illicit Irish whiskey | 21 |
| Illicit leaves | 14 |
| Illicit lenders | 15 |
| Illicit liquor, colloquially | 28 |
| Illicit love affair | 19 |
| Illicit love affairs | 20 |
| Illicit memory aid | 18 |
| Illicit Prohibition-era establishment | 37 |
| Illicit publishers? | 19 |
| Illicit rendezvous locale | 25 |
| Illicit reserve | 15 |
| Illicit smoke | 13 |
| Illicit smoke, slangily | 23 |
| Illicit stimulant, for short | 28 |
| Illicit use of authority | 24 |
| Illicit use of authority using brute force | 42 |
| Illicit vault access | 20 |
| Illicit, as a sale | 18 |
| Illicit-spirits dealer | 22 |
| Illiciting stares from the punctual | 35 |
| Illicitly distilled liquor | 26 |
| Illicitly distilled whiskey | 27 |
| Illicitly gained goods | 22 |
| Illimitable | 11 |
| Illinois | 8 |
| Illinois airport | 16 |
| Illinois arrival site | 21 |
| Illinois Benedictine College site | 33 |
| Illinois bird? | 14 |
| Illinois birth city of Cindy Crawford | 37 |
| Illinois birthplace of Fred MacMurray | 37 |
| Illinois birthplace of Newhart and Hemingway | 44 |
| Illinois birthplace of Richard Pryor and Betty Friedan | 54 |
| Illinois birthplace of Tinkertoys and ice cream sundaes | 55 |
| Illinois birthplace of William Jennings Bryan | 45 |
| Illinois border sharer | 22 |
| Illinois cheerleader's frequent request | 43 |
| Illinois city | 13 |
| Illinois city famed for test-marketing | 38 |
| Illinois city near St. Louis | 28 |
| Illinois city near St.Louis | 27 |
| Illinois city on the Mississippi | 32 |
| Illinois city or county | 23 |
| Illinois city symbolizing mainstream America | 44 |
| Illinois city symbolizing middle America | 40 |
| Illinois city that symbolizes Middle America | 44 |
| Illinois city where HAL from "2001" was purportedly programmed | 72 |
| Illinois city where Roger Ebert was born | 40 |
| Illinois city where William Jennings Bryan was born | 51 |
| Illinois city, for short | 24 |
| Illinois city, site of the last Lincoln-Douglas debate | 54 |
| Illinois clock setting | 22 |
| Illinois college | 16 |
| Illinois college town | 21 |
| Illinois county or its seat | 27 |
| Illinois emo hair band? | 23 |
| Illinois first name | 19 |
| Illinois fowl? | 14 |
| Illinois governor before Blagojevich | 36 |
| Illinois governor Blagojevich | 29 |
| Illinois home of Black Hawk College | 35 |
| Illinois home of Caterpillar | 28 |
| Illinois home of Rotary International | 37 |
| Illinois home of the John Deere Pavilion | 40 |
| Illinois home to Caterpillar, Inc. | 34 |
| Illinois Indian | 15 |
| Illinois junior senator | 23 |
| Illinois name | 13 |
| Illinois neighbor | 17 |
| Illinois neighbor: Abbr. | 24 |
| Illinois NFL team | 17 |
| Illinois or Colorado city | 25 |
| Illinois or Indiana city | 24 |
| Illinois or Oriental, briefly, in Monopoly | 42 |
| Illinois politician Henry and family | 36 |
| Illinois pop-punkers | 20 |
| Illinois refresher | 18 |
| Illinois representative since 1995 | 34 |
| Illinois river | 14 |
| Illinois River city | 19 |
| Illinois River port | 19 |
| Illinois rockers Sleeping ___ | 29 |
| Illinois senator | 16 |
| Illinois senator Barack | 23 |
| Illinois senator Barack __ | 26 |
| Illinois senator Obama | 22 |
| Illinois senator who became president | 37 |
| Illinois senator-turned-president | 33 |
| Illinois site of a Civil War prison | 35 |