| TFTitan Foundry Svcs INC | Hamilton | IL | Miscellaneous Manufacturing339999 | 1-19 | ◇ UNVERIFIED |
| THTranscontinental Hs Crocker INC | Huntley | IL | Paper Manufacturing322221 | 100-499 | ◇ UNVERIFIED |
| TPTreehouse Private Brands INC | South Beloit | IL | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| TCTricast/presfore CORP | Crystal Lake | IL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| UGUniversal Grinding & Tool Service INC | Berkeley | IL | Machinery Manufacturing333514 | — | ◇ UNVERIFIED |
| VBVaughan & Bushnell Mfg CO | Hebron | IL | Fabricated Metal Product Manufacturing332212 | 100-499 | ◇ UNVERIFIED |
| VMVermilion Millworks LLC | Danville | IL | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| WIWear-cote International INC | Rock Island | IL | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| WSWestern Sand and Gravel CO LLC | Spring Valley | IL | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◇ UNVERIFIED |
| WCWestrock Converting CO | Aurora | IL | Paper Manufacturing322130 | — | ◇ UNVERIFIED |
| WFWestwick Foundry LTD | Galena | IL | Primary Metal Manufacturing331511 | 1-19 | ◇ UNVERIFIED |
| ZTZebra Technologies CORP | Vernon Hills | IL | Computer and Electronic Product Manufacturing334118 | — | ◇ UNVERIFIED |
| 2M28 Mile Vodka CO LLC | Highwood | IL | Beverage and Tobacco Product Manufacturing312140 | — | ◇ UNVERIFIED |
| 3E300 East Devon LLC | West Chicago | IL | Food Manufacturing311230 | — | ◇ UNVERIFIED |
| 3C3com CORP | Morton Grove | IL | Computer and Electronic Product Manufacturing334210 | — | ◇ UNVERIFIED |
| 3C3m CO | Summit Argo | IL | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| 4W4513 Western Avenue LLC | Lisle | IL | Computer and Electronic Product Manufacturing334210 | — | ◇ UNVERIFIED |
| 4A47 Asphalt Co/subsidiary of K-five Construction | Newark | IL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| 5A5th Ave Coating Svc Ctr | East Moline | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| 7E7 Eleven #33084 | Palos Heights | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| 737-eleven 33135 | Elgin | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ACA-1 Custom Marble INC | Crystal Lake | IL | Plastics and Rubber Products Manufacturing326191 | — | ◇ UNVERIFIED |
| ALA-1 Lapping & Machine | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| AMA-1 Maintenance | Urbana | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| AWA-1 Wire Tech INC. | Rockford | IL | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| ABA&a Body Shop INC | Palatine | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| AHAai Heavy Rebuilders | Rockford | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ACAam-ro CORP | Broadview | IL | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| APAargus Plastics INC | Des Plaines | IL | Plastics and Rubber Products Manufacturing326111 | — | ◇ UNVERIFIED |
| APAargus Plastics INC | Wheeling | IL | Plastics and Rubber Products Manufacturing326111 | — | ◇ UNVERIFIED |
| AAAaron Ablinger | Ivesdale | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| ASAbbate Stamping & Mfg., INC. | Bensenville | IL | Machinery Manufacturing333514 | — | ◇ UNVERIFIED |
| AFAbbey Finishing CORP | Chicago | IL | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| ALAbbott Laboratories | North Chicago | IL | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| ALAbbott Laboratories | Waukegan | IL | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| ADAb Dick CO | Niles | IL | Machinery Manufacturing333310 | — | ◇ UNVERIFIED |
| ACAbell-howe Crane | Forest Park | IL | Machinery Manufacturing333414 | — | ◇ UNVERIFIED |
| AAbf | Waukegan | IL | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| ALAbf Laboratories | Waukegan | IL | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| AEAbility Engineering | South Holland | IL | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| ACAbitec CORP | Paris | IL | Food Manufacturing311222 | — | ◇ UNVERIFIED |
| ARAbrasive Rubber Wheel | Fox Lake | IL | Nonmetallic Mineral Product Manufacturing327910 | — | ◇ UNVERIFIED |
| ATAbrasive Technology INC | South Elgin | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| AGAbs Graphics INC | Addison | IL | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ASAb Specialty Silicones | Waukegan | IL | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| ASAcacia Spice CO | Gurnee | IL | Food Manufacturing311942 | — | ◇ UNVERIFIED |
| ACAccel Color INC | Naperville | IL | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| AAccelent | Wheeling | IL | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| AUAcco USA INC | Wheeling | IL | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
| AIAccra Industries INC | South Beloit | IL | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
