| ACAeropres Corporation | Manhattan | IL | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| ACAeropress CORP | Manhattan | IL | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| AFA Finkl & Sons CO | Chicago | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| ACA.g. Communications Systems | Northlake | IL | Computer and Electronic Product Manufacturing334000 | — | ◇ UNVERIFIED |
| ACAg Communication Systems | Genoa | IL | Computer and Electronic Product Manufacturing334419 | — | ◇ UNVERIFIED |
| ANAgi North America LLC | Jacksonville | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ANAgi North America LLC | Melrose Park | IL | Paper Manufacturing322212 | — | ◇ UNVERIFIED |
| AIAgri-load INC | Joliet | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| AFAgripride Fs INC | Breese | IL | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| AUAgrium US INC | Marseilles | IL | Chemical Manufacturing325311 | — | ◇ UNVERIFIED |
| AGAircraft Gear CORP | Bedford Park | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| APAircraft Propeller Service LLC | Lake Zurich | IL | Transportation Equipment Manufacturing336412 | — | ◇ UNVERIFIED |
| ARAirgas Roxana - Woodriver, Il Co2 Plant | Roxana | IL | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| AUAirgas USA LLC | Chicago | IL | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| APAir Products & Chemicals INC | Joliet | IL | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| APAir Products Manufacturing CORP. | Granite City | IL | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| APAirtex Products | Fairfield | IL | Transportation Equipment Manufacturing336399 | — | ◇ UNVERIFIED |
| APAirtex Products Division | Fairfield | IL | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| APAirtex Products INC | Fairfield | IL | Transportation Equipment Manufacturing336312 | — | ◇ UNVERIFIED |
| ADAj Daw Printing Ink CO | Countryside | IL | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| APA&j Plating CO INC | River Grove | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| APAkers Packaging Service INC | Chicago | IL | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| AIAkj Industries INC | Granite City | IL | Petroleum and Coal Products Manufacturing324199 | — | ◇ UNVERIFIED |
| ARA-korn Roller INC | Chicago | IL | Machinery Manufacturing333998 | — | ◇ UNVERIFIED |
| ANAkzo Nobel Non-stick Coatings LLC | Des Plaines | IL | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| ANAkzo Nobel Surface Chemistry LLC | Mccook | IL | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| AMAlabama Metal Industries CORP | Bourbonnais | IL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| ABAl-amir Bakery INC D/b/a Sanabel Bakery | Chicago | IL | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| AGAlamo Group (il) INC | Gibson City | IL | Machinery Manufacturing333111 | — | ◇ UNVERIFIED |
| ACAlamp Concrete Contractors INC | Maywood | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ACAlamp Concrete Contractors INC | Northbrook | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| AMAlbany Molecular Research INC | Mt Prospect | IL | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| AMAlbar Metals | Wheeling | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ACAlberto Culver | Melrose Park | IL | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| APAlcan Packaging | Centralia | IL | Plastics and Rubber Products Manufacturing326160 | — | ◇ UNVERIFIED |
| AFAlcasco Foundry | Harvey | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| AIAlchemitron INC | Elgin | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| AFAlcoa Flexible Packaging LLC | Wheaton | IL | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| ALA & L Construction | Melrose Park | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| ASAlessio & Sons CO | Norridge | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ALAlexander Lumber | Lincoln | IL | Wood Product Manufacturing321912 | — | ◇ UNVERIFIED |
| ALAlfa Laval INC | Melrose Park | IL | Machinery Manufacturing333415 | — | ◇ UNVERIFIED |
| ALAlfa Laval Inc-standard Refrigeration | Wood Dale | IL | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
| AEAlgonquian Ethanol LLC | Princeton | IL | Chemical Manufacturing325193 | — | ◇ UNVERIFIED |
| AAAll American Ready Mix INC | Springfield | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ACAll Cleaners | Aurora | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ASAllerton Supply Company INC. (fairmont) | Fairmount | IL | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| AIAllfoam Ind INC | Elmhurst | IL | Plastics and Rubber Products Manufacturing326140 | — | ◇ UNVERIFIED |
| AFAllfresh Foods Products INC | Evanston | IL | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| ATAlliance Tubular Holdings LLC | Dixmoor | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
