| NANorth American Stevedoring CO (formerly Ceres) | Chicago | — | ◇ UNVERIFIED |
| NBNtn Bearing | Des Plaines | — | ◇ UNVERIFIED |
| NNtt/verio | Chicago | — | ◇ 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 |
| PMParkview Metal Products INC | Lake Zurich | — | ◇ 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 |
| PMPerfect Mulch Products INC | Mccook | — | ◇ 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 |
| PPPioneer Powder | Franklin Park | — | ◇ UNVERIFIED |
| PCPiper Corvette Specialties | Vermilion | — | ◇ UNVERIFIED |
| PSPlainfield Stamping-illinois | Plainfield | — | ◇ UNVERIFIED |
| PAPorter Athletic Equipment CO | Broadview | — | ◇ UNVERIFIED |
| PCPowder Coat V INC | Astoria | — | ◇ UNVERIFIED |
| PHPower Holdings of Illinois | Ashley | — | ◇ UNVERIFIED |
| PRPower Recycling INC | Collinsville | — | ◇ UNVERIFIED |
| POPowerscreen of Chicago | Harvey | — | ◇ UNVERIFIED |
| PFPrairieland Fs INC | Jacksonville | — | ◇ UNVERIFIED |
| PIPraxair INC | La Grange Park | — | ◇ UNVERIFIED |
| PCPrecision Composite INC | Montgomery | — | ◇ UNVERIFIED |
| PFPrecision Foundry Tooling LTD | Hamilton | — | ◇ UNVERIFIED |
| PAPremier Air Center INC Dba West Star Aviation INC | East Alton | — | ◇ UNVERIFIED |
| PFPrestige Feed Products LLC | Mount Prospect | — | ◇ UNVERIFIED |
| PPresto-x | Des Plaines | — | ◇ UNVERIFIED |
| PMPrevue Metal Prod INC | Chicago | — | ◇ UNVERIFIED |
| PCProbuild CO LLC | Yorkville | — | ◇ UNVERIFIED |
| PMPure Metal Recycling - Site B | Chicago | — | ◇ UNVERIFIED |
