| Entity Name | Type | License # | City | Status | Action |
|---|---|---|---|---|---|
| NORTHWEST METRO SECURITY INC | Business | 123000248 | OAK PARK | NOT RENEWED | Verify |
| NORTHWEST METRO SECURITY INC | Business | 122000881 | BLOOMINGDALE | NOT RENEWED | Verify |
| NORTHWEST METRO SECURITY INC | Business | 123000301 | DEERFIELD | NOT RENEWED | Verify |
| NORTHWEST POLICE ACADEMY | Business | 201000829 | ARLINGTON HEIGHTS | ACTIVE | Verify |
| NORTHWEST SEC SERV & | Business | 122000135 | HARWOOD HEIGHTS | NOT RENEWED | Verify |
| NORTHWEST SECURITY SERVICE AND | Business | 201000167 | CHICAGO | ACTIVE | Verify |
| NORTHWEST SUBURBAN INVESTIGATIONS INC | Business | 117001525 | MCHENRY | NOT RENEWED | Verify |
| NORTHWEST SUBURBAN PATROL INC | Business | 122000855 | MOUNT PROSPECT | ACTIVE | Verify |
| NORTHWEST SUBURBAN TACTICAL TRAINING CENTER | Business | 102000261 | MCHENRY | ACTIVE | Verify |
| NORTHWESTERN MEMORIAL HOSPITAL | Business | 120000022 | CHICAGO | NOT RENEWED | Verify |
| NORTHWESTERN MEMORIAL HOSPITAL | Business | 120000010 | CHICAGO | NOT RENEWED | Verify |
| NORTHWESTERN MEMORIAL HOSPITAL | Business | 201000189 | CHICAGO | ACTIVE | Verify |
| NORTHWESTERN MEMORIAL HOSPITAL SEC DEPT | Business | 102000026 | CHICAGO | ACTIVE | Verify |
| NORTHWESTERN MEMORIAL HOSPITAL SECURITY | Business | 120100013 | CHICAGO | NOT RENEWED | Verify |
| NORTHWESTERN SAVINGS | Business | 120500038 | BERWIN | NOT RENEWED | Verify |
| NOVA COMMUNICATIONS INC | Business | 127000551 | GENEVA | NOT RENEWED | Verify |
| NOVA FIRE PROTECTION INC | Business | 127001830 | SCHAUMBURG | ACTIVE | Verify |
| NOYS LOCKSMITHS | Business | 192000354 | SKOKIE | ACTIVE | Verify |
| NPG CONTROL SERVICES INC | Business | 122000930 | ROSELLE | ACTIVE | Verify |
| NSG INVESTIGATIVE SERVICES INC | Business | 117001794 | CHICAGO | NOT RENEWED | Verify |
| NTA CORPORATION | Business | 117000246 | WESTERN SPRINGS | NOT RENEWED | Verify |
| NTC ELECTRONICS INC | Business | 127000702 | ALSIP | NOT RENEWED | Verify |
| NU AGE INC | Business | 127000742 | CHICAGO | NOT RENEWED | Verify |
| NUGGET ENTERPRISES INC | Business | 127001433 | BARRINGTON | NOT RENEWED | Verify |
| NWSI GROUP LLC | Business | 117001821 | NORTH CHICAGO | ACTIVE | Verify |
| NWSI GROUP LLC | Business | 122001481 | NORTH CHICAGO | ACTIVE | Verify |
| O D P INCORPORATED | Business | 117000348 | BUFFALO GROVE | NOT RENEWED | Verify |
| O K J SECURITY & INVESTIGATION | Business | 118000149 | ELMHURST | CLOSED | Verify |
| O K J SECURITY & INVESTIGATION | Business | 117000647 | CHICAGO | NOT RENEWED | Verify |
| O K J SECURITY & INVESTIGATIONS INC | Business | 123000187 | CHICAGO | NOT RENEWED | Verify |
| O K J SECURITY & INVESTIGATIONS INC | Business | 122000558 | CHICAGO | INOPERATIVE | Verify |
| O K J SECURITY AND | Business | 127000860 | CHICAGO | NOT RENEWED | Verify |
| O T A DETECTIVE AGENCY | Business | 117000413 | CHICAGO | NOT RENEWED | Verify |
| O'HERN TRAFFIC ACCIDENT CONSULTANTS INC | Business | 117001489 | TINLEY PARK | ACTIVE | Verify |
| O'ROURKE & FROST INC | Business | 117001225 | CHICAGO | NOT RENEWED | Verify |
| OAK BROOK SECURITY SERVICE INC | Business | 127000579 | WESTMONT | NOT RENEWED | Verify |
| OAK FIRE AND SECURITY SYSTEMS INC | Business | 127001011 | HOMER GLEN | ACTIVE | Verify |
| OAK TERRACE ACTIVE RETIREMENT COMMUNITY | Business | 120100020 | SPRINGFIELD | CANCELLED | Verify |
| OBERLANDER ALARM SYSTEMS INC | Business | 127000834 | PEORIA | ACTIVE | Verify |
| OBERLANDER COMMUNICATIONS AND SECURITY | Business | 127000838 | PEORIA | INOPERATIVE | Verify |
| ODEUM SPORTS AND EXPO CENTER | Business | 120100038 | VILLA PARK | CANCELLED | Verify |
| ODOM SECURITY SERVICES PLLC | Business | 122001589 | HARVEY | ACTIVE | Verify |
| ODYSSEY PROTECTION SYSTEMS INC | Business | 127001023 | PLAINFIELD | NOT RENEWED | Verify |
| ODYSSEY PROTECTION SYSTEMS INC | Business | 128000137 | PLAINFIELD | NOT RENEWED | Verify |
| OESTREICH SALES & SERVICE INC | Business | 192000103 | BEECHER | ACTIVE | Verify |
| OFF DUTY COPS INCORP | Business | 117000236 | CHICAGO | NOT RENEWED | Verify |
| OFF DUTY COPS INCORPORATED | Business | 122000152 | CHICAGO | NOT RENEWED | Verify |
| OFF DUTY INC | Business | 123000273 | FRANKFORT | NOT RENEWED | Verify |
| OFF DUTY INC | Business | 122000805 | MANHATTAN | ACTIVE | Verify |
| OFF DUTY MEDIC INCORPORATED | Business | 122001183 | ALSIP | NOT RENEWED | Verify |