Hanger Prosthetics & Orthotics East, INC. | Mchenry, IL | Miscellaneous Manufacturing339113 | — | ● ACTIVE |
| HIHarrington Industrial Plastics LLC | Woodridge, IL | Plastics and Rubber Products Manufacturing326122 | — | ● ACTIVE |
Harting INC. of North America | Elgin, IL | Computer and Electronic Product Manufacturing334417 | — | ● ACTIVE |
Hcg Marketing Ventures LLC | Chicago, IL | Fabricated Metal Product Manufacturing332812 | — | ● ACTIVE |
Hcold INC. | Countryside, IL | Machinery Manufacturing333241 | — | ● ACTIVE |
Heat Wagons INC | Valparaiso, IN | Machinery Manufacturing333414 | — | ● ACTIVE |
Hedjak, INC | Yorkville, IL | Apparel Manufacturing315990 | — | ● ACTIVE |
| HCHeidenhain CORP | Schaumburg, IL | Computer and Electronic Product Manufacturing334519 | — | ● ACTIVE |
| HIHeidts Industrial LLC | Lake Zurich, IL | Transportation Equipment Manufacturing336330 | — | ● ACTIVE |
| HLHeim LP | Chicago, IL | Machinery Manufacturing333517 | — | ● ACTIVE |
| HLHidrostal LLC | Aurora, IL | Machinery Manufacturing333914 | 20–99 | ● ACTIVE |
Hirschmann Engineering Usa, INC. | Schaumburg, IL | Miscellaneous Manufacturing339999 | — | ● ACTIVE |
Hiwin Corporation | Huntley, IL | Miscellaneous Manufacturing339999 | — | ● ACTIVE |
H L Clausing INC | Skokie, IL | Nonmetallic Mineral Product Manufacturing327215 | — | ● ACTIVE |
| HMHochbaum Machine Services, INC. | Hebron, IN | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
H-o-h Water Technology, INC. | Palatine, IL | Chemical Manufacturing325998 | — | ● ACTIVE |
Holly Hunt Enterprises INC | Chicago, IL | Furniture and Related Product Manufacturing337121 | — | ● ACTIVE |
Hover Away, INC. | Highland Park, IL | Fabricated Metal Product Manufacturing332999 | — | ● ACTIVE |
Howe CORP | Chicago, IL | Machinery Manufacturing333415 | — | ● ACTIVE |
Hur USA INC | Park Ridge, IL | Miscellaneous Manufacturing339920 | — | ● ACTIVE |
| HMHy-tek Manufacturing Co., INC. | Sugar Grove, IL | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
Ic Signs and Graphics, LLC | Highwood, IL | Miscellaneous Manufacturing339950 | — | ● ACTIVE |
ICU Medical Inc. | Gary, IN | Miscellaneous Manufacturing339112 | 20–99 | ● ACTIVE |
| IFIDI Fabrication, Inc. d.b.a. The Gund Company Inc. | Lemont, IL | Fabricated Metal Product Manufacturing332710 | 1–19 | ● ACTIVE |
Ifl Manufacturing INC. | Wauconda, IL | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
Ikonix USA LLC | Lake Forest, IL | Computer and Electronic Product Manufacturing334515 | — | ● ACTIVE |
Illinois Auto Truck CO INC | Des Plaines, IL | Transportation Equipment Manufacturing336350 | — | ● ACTIVE |
Illinois Tool Works INC. | Lake Bluff, IL | Computer and Electronic Product Manufacturing334519 | — | ● ACTIVE |
Illinois Tool Works, INC. | Lincolnshire, IL | Machinery Manufacturing333517 | — | ● ACTIVE |
Imagineering INC | Elk Grove Village, IL | Computer and Electronic Product Manufacturing334418 | — | ● ACTIVE |
| IMImi Manufacturing INC | Bolingbrook, IL | Fabricated Metal Product Manufacturing332313 | — | ● ACTIVE |
Impossible Objects, INC. | Northbrook, IL | Machinery Manufacturing333248 | — | ● ACTIVE |
Impressive Construction INC | Villa Park, IL | Nonmetallic Mineral Product Manufacturing327390 | — | ● ACTIVE |
| IEIMS Engineered Products | Des Plaine, IL | Fabricated Metal Product Manufacturing332322 | 100–499 | ● ACTIVE |
Incompass, LLC | Chicago, IL | Machinery Manufacturing333519 | — | ● ACTIVE |
Incon Industries, INC. | Saint Charles, IL | Chemical Manufacturing325199 | — | ● ACTIVE |
| ISIndependent Suppliers Group INC | Rosemont, IL | Miscellaneous Manufacturing339940 | — | ● ACTIVE |
Induction Innovations, INC. | Elgin, IL | Machinery Manufacturing333994 | — | ● ACTIVE |
Industrial Tool Products INC | Schiller Park, IL | Machinery Manufacturing333923 | — | ● ACTIVE |
Infinitybox, LLC | Chicago, IL | Transportation Equipment Manufacturing336320 | — | ● ACTIVE |
Ink Spot Printing & Design, INC. | Bloomingdale, IL | Printing and Related Support Activities323111 | — | ● ACTIVE |
Innopsys, INC. | Chicago, IL | Computer and Electronic Product Manufacturing334516 | — | ● ACTIVE |
Innova Systems INC | Burr Ridge, IL | Miscellaneous Manufacturing339115 | — | ● ACTIVE |
| ICInplex Custom Extruders LLC | Naperville, IL | Plastics and Rubber Products Manufacturing326121 | 20–99 | ● ACTIVE |
Inpulse LLC | Palatine, IL | Fabricated Metal Product Manufacturing332813 | — | ● ACTIVE |
| IIIntellisource INC | East Dundee, IL | Printing and Related Support Activities323111 | — | ● ACTIVE |
International Computer Concepts INC | Northbrook, IL | Computer and Electronic Product Manufacturing334111 | — | ● ACTIVE |
International Promotional Ideas, INC. | Skokie, IL | Miscellaneous Manufacturing339940 | — | ● ACTIVE |
International Road Dynamics Corporation | Spring Grove, IL | Machinery Manufacturing333998 | — | ● ACTIVE |
International Valve Marketing, LLC | Sugar Grove, IL | Fabricated Metal Product Manufacturing332911 | — | ● ACTIVE |