| CDCentral Die Casting | Chicago | IL | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| CSCentral Steel & Wire CO | Chicago | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
 Cenveo Worldwide LTD | Chicago | IL | Paper Manufacturing322230 | — | ◇ UNVERIFIED |
| CAChicago Allis Mfg CORP | Chicago | IL | Plastics and Rubber Products Manufacturing326299 | — | ◇ UNVERIFIED |
| CAChicago Aluminum Castings CO INC | Chicago | IL | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| CBChicago Baking CO | Chicago | IL | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| CBChicago Board of Education | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCChicago, City of | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CDChicago Dowel CO INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CGChicago Gaming Cabinets | Chicago | IL | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| CPChicago Plating INC | Chicago | IL | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| CPChicago Press CORP | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| CSChicago Specialties, LLC | Chicago | IL | Chemical Manufacturing325100 | — | ◇ UNVERIFIED |
| CSChicago Steel Rule Die & Fabricators CO | Chicago | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| CSChicago Sterilization Services | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CTChicago Title Land Trust | Chicago | IL | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
| CMChilo Manufacturing & Plating Company | Chicago | IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| COCity of Chicago | Chicago | IL | Paper Manufacturing322212 | — | ◇ UNVERIFIED |
| CCClear Channel Outdoor | Chicago | IL | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| CPClorox Products | Chicago | IL | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| CMClybourn Metal Finishing CO | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CCCoke Contracting INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CFColumbus Foods | Chicago | IL | Petroleum and Coal Products Manufacturing324199 | — | ◇ UNVERIFIED |
| CFCommercial Forged Products | Chicago | IL | Fabricated Metal Product Manufacturing332111 | — | ◇ UNVERIFIED |
| CIConnelly-gpm INC | Chicago | IL | Fabricated Metal Product Manufacturing332618 | — | ◇ UNVERIFIED |
| CCConsolidated Chemical Works LTD | Chicago | IL | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| CMCowhey Materials and Fuel | Chicago | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CPCraftsman Plating & Tinning | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CPCraftsman Plating & Tinning CORP | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CECrawford Electric Generating Station | Chicago | IL | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| CLCrawford Laboratories | Chicago | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| COCudner & O'connor CO | Chicago | IL | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| DSDa Stuart CO | Chicago | IL | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| DMDehler Manufacturing CO INC | Chicago | IL | Furniture and Related Product Manufacturing337124 | — | ◇ UNVERIFIED |
| DTDelta Technologies | Chicago | IL | Electrical Equipment, Appliance & Component Manufacturing335313 | — | ◇ UNVERIFIED |
| DPDiemand Printing CO INC | Chicago | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| DPDiemand Printing CO INC | Chicago | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| DRDigital Realty Trust LP | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| DIDike-o-seal INC | Chicago | IL | Machinery Manufacturing333248 | — | ◇ UNVERIFIED |
| DIDover Industrial Chrome INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| DKDreis & Krump Mfg CO | Chicago | IL | Machinery Manufacturing333513 | — | ◇ UNVERIFIED |
| DSDurable Specialty Coatings | Chicago | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| DADuro Art Industries INC | Chicago | IL | Miscellaneous Manufacturing339994 | — | ◇ UNVERIFIED |
| EPEaglebrook Plastics INC | Chicago | IL | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| EGEagle Grinding Wheel CORP | Chicago | IL | Nonmetallic Mineral Product Manufacturing327910 | — | ◇ UNVERIFIED |
| EPEagle Painting & Maint CO | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| EFEconomy Folding Box CORP | Chicago | IL | Paper Manufacturing322212 | — | ◇ UNVERIFIED |
| EPEconomy Plating INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| EMEdsal Manufacturing CO INC | Chicago | IL | Fabricated Metal Product Manufacturing332119 | — | ◇ UNVERIFIED |
| E3Eleven 35 LLC | Chicago | IL | Electrical Equipment, Appliance & Component Manufacturing335312 | — | ◇ UNVERIFIED |
