| NPNavy Pier INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NCNazdar Chicago | Chicago | IL | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| NLNcm LLC | Chicago | IL | Food Manufacturing311611 | — | ◇ UNVERIFIED |
| NRNehi Royal Crown CORP | Chicago | IL | Beverage and Tobacco Product Manufacturing312111 | — | ◇ UNVERIFIED |
| NHNelson Harkins Industries | Chicago | IL | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| NPNew Packing CO | Chicago | IL | Food Manufacturing311612 | — | ◇ UNVERIFIED |
| NCNewsweb CORP | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| NHN Henry & Son INC | Chicago | IL | Apparel Manufacturing315990 | — | ◇ UNVERIFIED |
| NCNichem CORP | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NENina Enterprises INC | Chicago | IL | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| NANorth American Salt CO | Chicago | IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| NPNorthwestern Plating Works | Chicago | IL | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| OAOgden Avenue Materials INC | Chicago | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| OCO'hare Concrete Plant | Chicago | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| OFOn-cor Frozen Foods, LLC | Chicago | IL | Food Manufacturing311411 | — | ◇ UNVERIFIED |
| OMOremus Material LLC | Chicago | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| OLOrganics LLC | Chicago | IL | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| OIOrion Industries & Related Entities | Chicago | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| OLOrion Lubricant | Chicago | IL | Textile Mills313310 | — | ◇ UNVERIFIED |
| OBOzinga Bros INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OROzinga Ready Mix - 103rd St Plant | Chicago | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PCPackaging CORP of America | Chicago | IL | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| PCPallet City INC | Chicago | IL | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| PPPalmer Printing INC | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| PSParagon Spring and Stamping CO | Chicago | IL | Fabricated Metal Product Manufacturing332612 | — | ◇ UNVERIFIED |
| PNParisian Novelty CO | Chicago | IL | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| PMParkview Metal Products | Chicago | IL | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| PPaschen-newberg-foster | Chicago | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PBPasco Beverages INC | Chicago | IL | Food Manufacturing311411 | — | ◇ UNVERIFIED |
| PFPeer Food Products CO | Chicago | IL | Food Manufacturing311612 | — | ◇ UNVERIFIED |
| PGPepsi-cola General Bottlers INC | Chicago | IL | Beverage and Tobacco Product Manufacturing312111 | — | ◇ UNVERIFIED |
| PMPerformance Minerals CORP | Chicago | IL | Nonmetallic Mineral Product Manufacturing327420 | — | ◇ UNVERIFIED |
| PHP & H Plating CO INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| PPPioneer Plating CO | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| PEPlastech Engineered Products | Chicago | IL | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| PCPlastic Capacitors INC | Chicago | IL | Computer and Electronic Product Manufacturing334414 | — | ◇ UNVERIFIED |
| PSPlating Service CO | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| PMPrairie Material Sales - Plant 2 | Chicago | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PFPrecision Finishing | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| PFPrecision Forming & Stamping | Chicago | IL | Fabricated Metal Product Manufacturing332116 | — | ◇ UNVERIFIED |
| PMPrecoat Metals | Chicago | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| PMPremier Metal Finishing INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| PMPrevue Metal Prod INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| PAPure Asphalt CO | Chicago | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| PMPure Metals Recycling LLC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| QSQuality Snack Foods INC | Chicago | IL | Food Manufacturing311919 | — | ◇ UNVERIFIED |
| RARainbow Art CO | Chicago | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| RAReliable Asphalt CORP | Chicago | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| RGReliable Galvanizing CO INC | Chicago | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| RLReliable Laflin LLC | Chicago | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
