| ILLINOIS CORPORATE SECURITY | Business | 102000138 | WARRENVILLE | ACTIVE | Verify |
| ILLINOIS CORPORATE SECURITY NETWORK INC | Business | 122000574 | WARRENVILLE | INOPERATIVE | Verify |
| ILLINOIS COUNTIES DETECTIVE AGENCY INC | Business | 122000405 | MOUNT PROSPECT | INOPERATIVE | Verify |
| ILLINOIS COUNTIES DETECTIVE AGENCY INC | Business | 117000371 | MOUNT PROSPECT | NOT RENEWED | Verify |
| ILLINOIS COUNTIES SCHOOL OF | Business | 201000103 | MOUNT PROSPECT | ACTIVE | Verify |
| ILLINOIS COUNTIES TRAINING ACADEMY | Business | 102000206 | MOUNT PROSPECT | ACTIVE | Verify |
| ILLINOIS DEPT OF LAW | Business | 201000800 | SPRINGFIELD | ACTIVE | Verify |
| ILLINOIS DEPT OF LAW | Business | 201000810 | SPRINGFIELD | ACTIVE | Verify |
| ILLINOIS DETECTIVE AND SECURITY AGCY INC | Business | 117000167 | ELK GROVE VILLAGE | NOT RENEWED | Verify |
| ILLINOIS DETECTIVE AND SECURITY AGCY INC | Business | 201000184 | ELK GROVE VILLAGE | ACTIVE | Verify |
| ILLINOIS ENFORCEMENT AGENCY INC | Business | 122001086 | CAROL STREAM | NOT RENEWED | Verify |
| ILLINOIS FIRE EXTINGUISHER CO INC | Business | 127000499 | ADDISON | NOT RENEWED | Verify |
| ILLINOIS FIREARM TRAINING DIVISION | Business | 102000154 | ROCK FALLS | INOPERATIVE | Verify |
| ILLINOIS HOMELAND SECURITY SERVICES INC | Business | 122000991 | CHICAGO | NOT RENEWED | Verify |
| ILLINOIS INSTITUTE OF LAW ENFORCEMENT | Business | 201000151 | CHICAGO | CLOSED | Verify |
| ILLINOIS INSTITUTE OF TECHNOLOGY | Business | 120100041 | CHICAGO | NOT RENEWED | Verify |
| ILLINOIS INVESTIGATIVE AGENCY INC | Business | 118000257 | CHICAGO | NOT RENEWED | Verify |
| ILLINOIS INVESTIGATIVE AGENCY INC | Business | 123000327 | CHICAGO | NOT RENEWED | Verify |
| ILLINOIS INVESTIGATIVE GROUP LTD | Business | 117001405 | HOFFMAN ESTATES | ACTIVE | Verify |
| ILLINOIS LAW ENFORCEMENT ACADEMY | Business | 201000178 | CHICAGO | ACTIVE | Verify |
| ILLINOIS MOBILEHELP, PLLC | Business | 127001826 | DOWNERS GROVE | INOPERATIVE | Verify |
| ILLINOIS NATIONAL PROCESS SERVICE | Business | 117001313 | STREAMWOOD | NOT RENEWED | Verify |
| ILLINOIS PLANT PROTECTION INC | Business | 122000285 | MELROSE PARK | NOT RENEWED | Verify |
| ILLINOIS PLANT PROTECTION INC | Business | 123000063 | CHICAGO | NOT RENEWED | Verify |
| ILLINOIS PLANT PROTECTION INC | Business | 117000363 | MELROSE PARK | NOT RENEWED | Verify |
| ILLINOIS PROCESS SERVERS INCORPORATED | Business | 117001586 | SPRINGFIELD | CLOSED | Verify |
| ILLINOIS PROCESS SERVERS LLC | Business | 117001633 | SPRINGFIELD | ACTIVE | Verify |
| ILLINOIS PROCESS SERVICE INC | Business | 117000852 | WAUKEGAN | INOPERATIVE | Verify |
| ILLINOIS PROTECTION & INVESTIGATION LLC | Business | 117001458 | HARWOOD HEIGHTS | ACTIVE | Verify |
| ILLINOIS PROTECTION & INVESTIGATION LLC | Business | 122001093 | HARWOOD HEIGHTS | ACTIVE | Verify |
| ILLINOIS PUBLIC SAFETY TRAINING GROUP LLC | Business | 102000351 | BURBANK | ACTIVE | Verify |
| ILLINOIS SECRETARY OF STATE POLICE DEPT | Business | 201000206 | SPRINGFIELD | ACTIVE | Verify |
| ILLINOIS SECURITY AGENCY INC | Business | 122000772 | CHICAGO | NOT RENEWED | Verify |
| ILLINOIS SECURITY ALARMS LTD | Business | 127000856 | CHICAGO | INOPERATIVE | Verify |
| ILLINOIS SECURITY ALARMS LTD | Business | 128000103 | HICKORY HILLS | NOT RENEWED | Verify |
| ILLINOIS SECURITY AND INVESTIGATION LTD | Business | 122000694 | WARRENVILLE | NOT RENEWED | Verify |
| ILLINOIS SECURITY AND INVESTIGATIONS LTD | Business | 117000862 | WARRENVILLE | NOT RENEWED | Verify |
| ILLINOIS SECURITY ASSOCIATES INC | Business | 122000526 | CICERO | NOT RENEWED | Verify |
| ILLINOIS SECURITY OFFICERS TRAINING ACADEMY | Business | 102000276 | ROCK FALLS | ACTIVE | Verify |
| ILLINOIS SECURITY OFFICERS TRAINING INST | Business | 201000028 | WILMETTE | CLOSED | Verify |
| ILLINOIS SECURITY PROFESSIONALS INC | Business | 122001389 | CHICAGO | ACTIVE | Verify |
| ILLINOIS SECURITY PROTECTION INC | Business | 127001630 | BURBANK | ACTIVE | Verify |
| ILLINOIS SECURITY SERVICES INC | Business | 122000551 | CHICAGO | ACTIVE | Verify |
| ILLINOIS SECURITY SERVICES INC | Business | 102000175 | CHICAGO | ACTIVE | Verify |
| ILLINOIS SECURITY SERVICES INC | Business | 122000367 | CHICAGO | NOT RENEWED | Verify |
| ILLINOIS SECURITY SERVICES INC | Business | 123000314 | CHAMPAIGN | NOT RENEWED | Verify |
| ILLINOIS SECURITY SERVICES INC | Business | 117000422 | CHICAGO | NOT RENEWED | Verify |
| ILLINOIS SECURITY SERVICES INC | Business | 117000638 | CHICAGO | ACTIVE | Verify |
| ILLINOIS SECURITY SERVICES INC | Business | 123000156 | DANVILLE | NOT RENEWED | Verify |
| ILLINOIS SECURITY SPECIALISTS LLC | Business | 122001407 | LOCKPORT | ACTIVE | Verify |