| CMChicago Metal Polishing | Chicago | IL | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| CMCHICAGO METAL POLISHING, Inc. | Chicago | IL | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| CTChicago Transit Authority | Chicago | IL | Electrical Equipment, Appliance & Component Manufacturing335311 | — | ◇ UNVERIFIED |
| CVChicago Vacuum Castings CORP | Chicago | IL | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| CKCircle K 6782 | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCitgo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCitgo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCitgo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCitgo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCitgo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCitgo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCitgo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCitgo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCitgo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCitgo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCitgo | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CFCitgo Fuel & Mini Mart | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CFCity Foods INC. | Chicago | IL | Food Manufacturing311611 | — | ◇ UNVERIFIED |
| COCity of Chicago Fleet Mgmt | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| COCity of Chicago-streets and Sanitation, Auto Pound | Chicago | IL | Computer and Electronic Product Manufacturing334513 | — | ◇ UNVERIFIED |
| CPCloverhill Pastry Vend CORP | Chicago | IL | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| CGCme Group INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
 Com-graphics Inc., | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| CPCommercial Pallet, INC. | Chicago | IL | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| CECommonwealth Edison | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCCompact Cars | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CMCompass Minerals America INC. | Chicago | IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| CDComputer Digital Imaging, CORP. | Chicago | IL | Printing and Related Support Activities323115 | — | ◇ UNVERIFIED |
 Consolidated Printing Company INC. | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| CWContinental Windows and Glass Corporation | Chicago | IL | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CICooktek Induction Systems, LLC | Chicago | IL | Machinery Manufacturing333994 | — | ◇ UNVERIFIED |
| CCCopperweld Chicago Division | Chicago | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| CKCordova Kalas Properties LLC | Chicago | IL | Leather and Allied Product Manufacturing316110 | — | ◇ UNVERIFIED |
| CGCorporate Graphics of America, Incorporated. | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| CSCrcc Sifang America INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CMCreative Metal Products, INC | Chicago | IL | Furniture and Related Product Manufacturing337215 | — | ◇ UNVERIFIED |
| CVCreative Ventures Incorporated | Chicago | IL | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| CGCrestone Group, LLC. | Chicago | IL | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| CCCrosstech Communications Inc. | Chicago | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| CWCrystal Windows & Doors Il CORP. | Chicago | IL | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| DDD5 Design and Metal Fabrication, LLC | Chicago | IL | Fabricated Metal Product Manufacturing332311 | — | ◇ UNVERIFIED |
| DIDakkota Intergrated Systems | Chicago | IL | Transportation Equipment Manufacturing336399 | — | ◇ UNVERIFIED |
| DFDanlin Furniture | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DPDario's Pallets, CORP. | Chicago | IL | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| DBD&d Body Shop INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DRDeep Red Wine Merchants LLC | Chicago | IL | Beverage and Tobacco Product Manufacturing312130 | — | ◇ UNVERIFIED |
| DMDemeter Millwork, LLC | Chicago | IL | Furniture and Related Product Manufacturing337212 | — | ◇ UNVERIFIED |
| DUDepaul University School of Music | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DUDevon Union 76 | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DGD & G Pallet Service, INC. | Chicago | IL | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
