| MPMoore Painting CO | Alton | — | ◇ UNVERIFIED |
| MCMorris Community Landfill | Morris | — | ◇ UNVERIFIED |
| MGMorrison Grease Recycling INC | Morrison | — | ◇ UNVERIFIED |
| MTMpl Technologies INC | Franklin Park | — | ◇ UNVERIFIED |
| MPMrc Polymers INC | Chicago | — | ◇ UNVERIFIED |
| MRM&r Rubber CO | Belvidere | — | ◇ UNVERIFIED |
| MPMt Prospect Mail Pharmacy | Mount Prospect | — | ◇ UNVERIFIED |
| MCMulch Center the | North Chicago | — | ◇ UNVERIFIED |
| MCMulti / County Landfill | Villa Grove | — | ◇ UNVERIFIED |
| MDMusser Division-selmer CO INC | La Grange | — | ◇ UNVERIFIED |
| NCNational Chemical | Plainfield | — | ◇ UNVERIFIED |
| NGNatural Gas Pipeline CO of America | Chicago Heights | — | ◇ UNVERIFIED |
| NGNatural Gas Pipeline CO Station 206a | Altamont | — | ◇ UNVERIFIED |
| NPNavy Pier INC | Chicago | — | ◇ UNVERIFIED |
| NCNeri Contractors & Excavators INC | Lake in the Hills | — | ◇ UNVERIFIED |
| NCNestle Clinical Nutrition | Hopkins Park | — | ◇ UNVERIFIED |
| NCNichem CORP | Chicago | — | ◇ UNVERIFIED |
| NTNoah's Trading Post | Rockford | — | ◇ UNVERIFIED |
| NCNorco Cleaners INC | Dolton | — | ◇ UNVERIFIED |
| NANorth American Stevedoring CO (formerly Ceres) | Chicago | — | ◇ UNVERIFIED |
| NBNtn Bearing | Des Plaines | — | ◇ UNVERIFIED |
| ODOakfield Development | Rockton | — | ◇ UNVERIFIED |
| OPOak Park Village of | Oak Park | — | ◇ UNVERIFIED |
| OROak River Cleaners | Westchester | — | ◇ UNVERIFIED |
| OROak River Cleaners | Oak Park | — | ◇ UNVERIFIED |
| OSOld School Market INC | Sullivan | — | ◇ UNVERIFIED |
| OGOlen G. Parkhill Owner of Kendallwood Estates | Mahomet | — | ◇ UNVERIFIED |
| ODOmega Demolition CORP | Rosemont | — | ◇ UNVERIFIED |
| OROquawka River Terminal | Gladstone | — | ◇ UNVERIFIED |
| OSOsf St James Hospital | Pontiac | — | ◇ UNVERIFIED |
| OEOster Enterprises INC | Lemont | — | ◇ UNVERIFIED |
| OCOxy-dry CORP | Arlington Heights | — | ◇ UNVERIFIED |
| OBOzinga Bros INC | Chicago | — | ◇ UNVERIFIED |
| PPanatrol | Bedford Park | — | ◇ UNVERIFIED |
| PSParker Seals/gnp Operations | Elgin | — | ◇ UNVERIFIED |
| PLParty Lite Mfg | Batavia | — | ◇ UNVERIFIED |
| PMPaule Metal Recycling | Alorton | — | ◇ UNVERIFIED |
| PMPaul Michels, Jr. | Saint Joseph | — | ◇ UNVERIFIED |
| PSPaul Shields | Rantoul | — | ◇ UNVERIFIED |
| PPPci Pharmaceutical Services | Rockford | — | ◇ UNVERIFIED |
| PCPeabody Coal CO | Marissa | — | ◇ UNVERIFIED |
| PVPeace Village | Palos Park | — | ◇ UNVERIFIED |
| PSPenny Swain | Urbana | — | ◇ UNVERIFIED |
| PJPeoria Journal Star INC | Peoria | — | ◇ UNVERIFIED |
| PPPerformance Products INC | Rockford | — | ◇ UNVERIFIED |
| PEPermian Express Partners LLC | Steeleville | — | ◇ UNVERIFIED |
| PAPettit Auto and Truck Sales | Rockford | — | ◇ UNVERIFIED |
| PGPhilos Global Technologies INC | Buffalo Grove | — | ◇ UNVERIFIED |
| PCPiper Corvette Specialties | Vermilion | — | ◇ UNVERIFIED |
| PSPlainfield Stamping-illinois | Plainfield | — | ◇ UNVERIFIED |
