| LCLa-capannina-coffee/alacavannia Coffee | Chicago | IL | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| LCLa Casa Del Pueblo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| LPLake Point Foods INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| LLLakeside Lithography LLC | Chicago | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| LELakewood Engineering & Mfg CO | Chicago | IL | Machinery Manufacturing333412 | — | ◇ UNVERIFIED |
| LGLakin General CORP | Chicago | IL | Plastics and Rubber Products Manufacturing326299 | — | ◇ UNVERIFIED |
| LGLakin General CORP - Roller Division | Chicago | IL | Machinery Manufacturing333111 | — | ◇ UNVERIFIED |
| LSLamination Specialties | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| LPLashore Press INC | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| LILifoam Industries LLC | Chicago | IL | Plastics and Rubber Products Manufacturing326140 | — | ◇ UNVERIFIED |
| LPLuster Prod INC | Chicago | IL | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| MOMarine Oil Terminal | Chicago | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MGMarvel Group INC | Chicago | IL | Furniture and Related Product Manufacturing337214 | — | ◇ UNVERIFIED |
| MMMatchless Metal Polish CO | Chicago | IL | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| MLMelar Litho INC | Chicago | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| MIMenard INC | Chicago | IL | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| MFMetal Finishing Research CORP | Chicago | IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| MTMetromedia Technologies INC | Chicago | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| MBMetz Baking CO | Chicago | IL | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| MAMidway Airport Amc Buildings | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MFMidwest Folding Products | Chicago | IL | Furniture and Related Product Manufacturing337127 | — | ◇ UNVERIFIED |
| MPMills Pallet, INC. | Chicago | IL | Wood Product Manufacturing321920 | 1-19 | ◇ UNVERIFIED |
| MIMilton Industires INC | Chicago | IL | Plastics and Rubber Products Manufacturing326299 | — | ◇ UNVERIFIED |
| MLMixonsite LLC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MDModern Die Casting CORP | Chicago | IL | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| MAMorse Automotive CORP | Chicago | IL | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| MAMorse Automotive CORP | Chicago | IL | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| MPMrc Polymers INC | Chicago | IL | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| MPMrc Polymers INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NCNalco Chemical CO | Chicago | IL | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| NCNational Casein CO | Chicago | IL | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| NINational Interchem CORP | Chicago | IL | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| NFNatures Fynd | Chicago | IL | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| 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 |