| ASAmerican Sugar Refining INC | Chicago | IL | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| ATAmerican Thiessen LLC | Chicago | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
 American Wilbert Vault CORP | Chicago | IL | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| AMAmes Metal Products CO | Chicago | IL | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| AAnderson | Chicago | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ADApco Deburring & Polishing INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| APApollo Plastics | Chicago | IL | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| AAAppetizers and INC | Chicago | IL | Food Manufacturing311412 | — | ◇ UNVERIFIED |
| ACArchibald Candy Company | Chicago | IL | Food Manufacturing311330 | — | ◇ UNVERIFIED |
| ASArchitectural Specialty Products INC | Chicago | IL | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| ATArmstrong Tools INC | Chicago | IL | Machinery Manufacturing333515 | — | ◇ UNVERIFIED |
| AFAtk Foods INC | Chicago | IL | Food Manufacturing311612 | — | ◇ UNVERIFIED |
| AWAt&t Wireless Navy Pier-water | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ABAuto Bumper House & Parts INC | Chicago | IL | Paper Manufacturing322221 | — | ◇ UNVERIFIED |
| AIAwmco INC | Chicago | IL | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| AAztec | Chicago | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| BPBarnes Plating CORP | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| BIBellwood Industrial Plating INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| BUBerger US INC | Chicago | IL | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
| BFBerkshire Foods INC | Chicago | IL | Food Manufacturing311512 | — | ◇ UNVERIFIED |
| BPBerteau-lowell Plating Plating INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| BNBl Nickelson Iron & Metal | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| BCBloomer Chocolate Company | Chicago | IL | Food Manufacturing311320 | — | ◇ UNVERIFIED |
| BABoasso America | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| BIBobco INC | Chicago | IL | Computer and Electronic Product Manufacturing334412 | — | ◇ UNVERIFIED |
| BEBodine Electric CO | Chicago | IL | Electrical Equipment, Appliance & Component Manufacturing335312 | — | ◇ UNVERIFIED |
| BCBoeing Company | Chicago | IL | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| BCBook Covers INC | Chicago | IL | Paper Manufacturing322130 | — | ◇ UNVERIFIED |
| BCBrachs Confections INC | Chicago | IL | Food Manufacturing311330 | — | ◇ UNVERIFIED |
| BLBridgeport Landings LLC | Chicago | IL | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| BTB & T Polishing INC | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| BWBulaw Welding | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| BCBway Corporation | Chicago | IL | Fabricated Metal Product Manufacturing332431 | — | ◇ UNVERIFIED |
| CPCalco Plating CO | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CRCalumet River Terminal | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCCandy & CO | Chicago | IL | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| CCCandy & CO | Chicago | IL | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| CWCapitol Wholesale Meats | Chicago | IL | Food Manufacturing311612 | — | ◇ UNVERIFIED |
| CPCarbit Paint CO | Chicago | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| CCCardinal Colorprint Printing | Chicago | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| CCCedar Concepts INC | Chicago | IL | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| 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 |
