| BOBentronics of Genral Electro CORP | Bensenville | IL | Computer and Electronic Product Manufacturing334412 | 1-19 | ◇ UNVERIFIED |
| BBBimbo Bakeries USA | Chicago | IL | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| BLBiologos LLC | Montgomery | IL | Chemical Manufacturing325414 | 1-19 | ◇ UNVERIFIED |
| BSBio Star Films LLC | Chicago | IL | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| BBBlunier Builders | Eureka | IL | Miscellaneous Manufacturing339999 | 20-99 | ◇ UNVERIFIED |
| BTBoley Tool & Machine | East Peoria | IL | Fabricated Metal Product Manufacturing332999 | 20-99 | ◇ UNVERIFIED |
| BCBranchfield Casting | Galva | IL | Primary Metal Manufacturing331513 | 20-99 | ◇ UNVERIFIED |
| BOBunge Oils INC | Bradley | IL | Food Manufacturing311224 | — | ◇ UNVERIFIED |
| CPCadore-miller Printing INC | Hickory Hills | IL | Printing and Related Support Activities323111 | 1-19 | ◇ UNVERIFIED |
| CICamtek INC | Bloomington | IL | Computer and Electronic Product Manufacturing334418 | — | ◇ UNVERIFIED |
| CPCastwell Products INC | Skokie | IL | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CICaterpillar INC | Joliet | IL | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| CWCentral Wood Products | Sullivan | IL | Wood Product Manufacturing321920 | 1-19 | ◇ UNVERIFIED |
| CBCentury Brass Works INC | Swansea | IL | Primary Metal Manufacturing331522 | 1-19 | ◇ UNVERIFIED |
| CChemtool | Rockton | IL | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| CPChicago Powdered Metal Products CO | Schiller Park | IL | Fabricated Metal Product Manufacturing332117 | — | ◇ UNVERIFIED |
| CPChromatech Printing INC | Des Plaines | IL | Printing and Related Support Activities323111 | 1-19 | ◇ UNVERIFIED |
| CMCoating Methods INC | Carpentersville | IL | Fabricated Metal Product Manufacturing332812 | 1-19 | ◇ UNVERIFIED |
| CCConex Cable LLC | Dekalb | IL | Primary Metal Manufacturing331316 | 20-99 | ◇ UNVERIFIED |
| CPConsolidated Paving INC | Peoria | IL | Petroleum and Coal Products Manufacturing324121 | 1-19 | ◇ UNVERIFIED |
| CCContractors Concrete INC | Effingham | IL | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◇ UNVERIFIED |
| CCCrown Cork & Seal CO INC | Warrensburg | IL | Fabricated Metal Product Manufacturing332431 | — | ◇ UNVERIFIED |
| COCudner & O'connor CO | Chicago | IL | Chemical Manufacturing325910 | 1-19 | ◇ UNVERIFIED |
| CCCustom Coating Innovations | Lebanon | IL | Plastics and Rubber Products Manufacturing326199 | 1-19 | ◇ UNVERIFIED |
| CTCustom Telephone Printing | Woodstock | IL | Printing and Related Support Activities323111 | 1-19 | ◇ UNVERIFIED |
| CCy-tec,inc. | Dekalb | IL | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| DEDawn Equipment CO | Sycamore | IL | Machinery Manufacturing333111 | 20-99 | ◇ UNVERIFIED |
 Dayton Superior CORP | Elk Grove Village | IL | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| DPDekalb Plating CO INC | Dekalb | IL | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| DCDelta Circuits | West Chicago | IL | Computer and Electronic Product Manufacturing334412 | 1-19 | ◇ UNVERIFIED |
| DBDiamond Blast CORP | Melrose Park | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| DIDoll's INC | Olney | IL | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◇ UNVERIFIED |
| DCDuratech Corporation | Centralia | IL | Plastics and Rubber Products Manufacturing326130 | 1-19 | ◇ UNVERIFIED |
| DCDuroweld CO INC | Lake Bluff | IL | Fabricated Metal Product Manufacturing332313 | 1-19 | ◇ UNVERIFIED |
| EBE.m. Bittner INC | Bristol | IL | Food Manufacturing311111 | 1-19 | ◇ UNVERIFIED |
| ESErickson Steel CO | Pekin | IL | Miscellaneous Manufacturing339999 | 1-19 | ◇ UNVERIFIED |
| FUFervalue USA INC | Chicago | IL | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| FPFlex Pak Packaging Products INC | Batavia | IL | Plastics and Rubber Products Manufacturing326112 | 1-19 | ◇ UNVERIFIED |
| FPForest Plating CO | Forest Park | IL | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| FCFurst-mcness CO | Freeport | IL | Food Manufacturing311119 | 100-499 | ◇ UNVERIFIED |
| GGalesburg | Galesburg | IL | Food Manufacturing311222 | — | ◇ UNVERIFIED |
| GEGem Equipment & Mfg | Roanoke | IL | Fabricated Metal Product Manufacturing332312 | 1-19 | ◇ UNVERIFIED |
| GPGenesis Packaging & Design | Lemont | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| GNGeorgia Nut CO | Skokie | IL | Food Manufacturing311351 | 500+ | ◇ UNVERIFIED |
| GCGlen-gery CORP | Marseilles | IL | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| GCGraphic Chemical & Ink CO | Villa Park | IL | Chemical Manufacturing325910 | 1-19 | ◇ UNVERIFIED |
| GIGraphics & Industrial Circuits | Kirkland | IL | Computer and Electronic Product Manufacturing334418 | 20-99 | ◇ UNVERIFIED |
| GGGreen Gables INC | Bradford | IL | Furniture and Related Product Manufacturing337122 | 20-99 | ◇ UNVERIFIED |
| HMHadady Machining CO INC | Lansing | IL | Fabricated Metal Product Manufacturing332999 | 20-99 | ◇ UNVERIFIED |
| HPHagg Press INC | Elgin | IL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
