| CSConcrete Supply LLC | Madison | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CSConcrete Supply LLC | Godfrey | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CSConcrete Supply LLC | Roxana | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CSConcrete Supply LLC | Roxana | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CIConmat INC | Dixon | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| CIConnelly-gpm INC | Chicago | IL | Fabricated Metal Product Manufacturing332618 | — | ◇ UNVERIFIED |
| CCConsolidated Carqueville Printing | Streamwood | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| CCConsolidated Container CO | Elk Grove Village | IL | Plastics and Rubber Products Manufacturing326160 | — | ◇ UNVERIFIED |
| CCConsolidated Container CO LP | Harvard | IL | Plastics and Rubber Products Manufacturing326160 | — | ◇ UNVERIFIED |
| CGConsolidated Grain & Barge CO | Lemont | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CSContainer Stapling Company | Herrin | IL | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| CTContanda Terminals | Riverdale | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCContech Construction Products | Springfield | IL | Plastics and Rubber Products Manufacturing326122 | — | ◇ UNVERIFIED |
| CMContemporary Marble INC | Columbia | IL | Plastics and Rubber Products Manufacturing326191 | — | ◇ UNVERIFIED |
| CMContinental Metals INC | La Salle | IL | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| CSContour Saws INC | Des Plaines | IL | Fabricated Metal Product Manufacturing332216 | — | ◇ UNVERIFIED |
| CCContractors Concrete INC | Pana | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CCContractors Concrete INC | Tolono | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CCContractors Concrete INC | Shelbyville | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CIConway Import CO INC | Franklin Park | IL | Food Manufacturing311421 | — | ◇ UNVERIFIED |
| CCCook Canton LLC | Canton | IL | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| CSCookie Specialties INC | Wheeling | IL | Food Manufacturing311821 | — | ◇ UNVERIFIED |
| CECookson Electronics | Buffalo Grove | IL | Printing and Related Support Activities323120 | — | ◇ UNVERIFIED |
| CBCooper B-line INC | Troy | IL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| CTCora Terminal LLC | Rockwood | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CBCorbion Biotech INC | Peoria | IL | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| CCCornick Concrete Products CO | Pekin | IL | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| CMCorpak Medsystems | Wheeling | IL | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CSCorrugated Supplies CO LLC | Bedford Park | IL | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| CWCostco Wholesale 1126 | East Peoria | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CWCostco Wholesale 774 | Lake in the Hills | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CMCounty Materials CORP | Springfield | IL | Nonmetallic Mineral Product Manufacturing327332 | — | ◇ UNVERIFIED |
| CPCounty Prestress LLC | Salem | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CPCounty Prestress LLC | Champaign | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CCovia | Ottawa | IL | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| CMCowhey Materials and Fuel | Chicago | IL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| CHCp Hall CO | Bedford Park | IL | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| CPCpi Packaging INC | Chicago Heights | IL | Plastics and Rubber Products Manufacturing326140 | — | ◇ UNVERIFIED |
| CCCraft Concrete Products INC | Cary | IL | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| CMCraftmaster Manufacturing INC | Plainfield | IL | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| CPCraftsman Plating & Tinning | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CPCraftsman Plating & Tinning CORP | Chicago | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CECrane Equipment & Service of Illinois Dba Washington Equipment | Eureka | IL | Machinery Manufacturing333923 | — | ◇ UNVERIFIED |
| CRCrane Revolving Door CO | Lake Bluff | IL | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| CICrank's Industrial Coating Service, LLC | Pekin | IL | Fabricated Metal Product Manufacturing332812 | 1-19 | ◇ UNVERIFIED |
| CECrawford Electric Generating Station | Chicago | IL | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| CGCrawford Gerald a | Savoy | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CLCrawford Laboratories | Chicago | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| CACreative Automation | Hillside | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| CMCreative Marble INC | Champaign | IL | Plastics and Rubber Products Manufacturing326191 | — | ◇ UNVERIFIED |
