| HPHydrafoce P1 | Lincolnshire | IL | Fabricated Metal Product Manufacturing332912 | 100-499 | ◐ LIKELY ACTIVE |
| HPHydrafoce P3 | Lincolnshire | IL | Fabricated Metal Product Manufacturing332912 | 100-499 | ◐ LIKELY ACTIVE |
IDEAL Industries, Inc. - South Prairie Manufacturing Building | Sycamore | IL | Fabricated Metal Product Manufacturing332216 | 100-499 | ◐ LIKELY ACTIVE |
| ICIFF-Gibson City | Gibson City | IL | Food Manufacturing311224 | 100-499 | ◐ LIKELY ACTIVE |
| IBIL02- Burr Ridge Fulfillment Center | Burr Ridge | IL | Food Manufacturing311991 | 100-499 | ◐ LIKELY ACTIVE |
| IMIL065 Mount Olive Container | Mt. Olive | IL | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| IMIL065 Mount Olive Container | Mount Olive | IL | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| IPIl133 Powervar, Mfg | Waukegan | IL | Electrical Equipment, Appliance & Component Manufacturing335999 | 100-499 | ◐ LIKELY ACTIVE |
| IRIl154 Rauland | Mount Prospect | IL | Computer and Electronic Product Manufacturing334418 | 100-499 | ◐ LIKELY ACTIVE |
| IAIl209 Amtek Bison Gear Engineering, INC. | St. Charles | IL | Electrical Equipment, Appliance & Component Manufacturing335312 | 100-499 | ◐ LIKELY ACTIVE |
| IAIl209 Amtek Bison Gear Engineering, INC. | Saint Charles | IL | Electrical Equipment, Appliance & Component Manufacturing335312 | 100-499 | ◐ LIKELY ACTIVE |
| IMImperial Manufacturing Group | Alton | IL | Fabricated Metal Product Manufacturing332996 | 100-499 | ◐ LIKELY ACTIVE |
| IBIMS Buhrke-Olson | Arlington Heights | IL | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
| IMIndustrial Maintenance and Welding | Chicago | IL | Machinery Manufacturing333517 | 100-499 | ◐ LIKELY ACTIVE |
| ISINEOS Styrolution - Naperville | Naperville | IL | Chemical Manufacturing325211 | 100-499 | ◐ LIKELY ACTIVE |
| IPInternational Paper Aurora Container | Aurora | IL | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| IPInternational Paper Des Plaines | Des Plaines | IL | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| IPInternational Paper Lincoln Container | Lincoln | IL | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| IPInternational Paper Montgomery | Montgomery | IL | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| ICIpsen Cherry Valley | Cherry Valley | IL | Machinery Manufacturing333994 | 100-499 | ◐ LIKELY ACTIVE |
| IGIrca Group EGV | Affton | IL | Food Manufacturing311351 | 100-499 | ◐ LIKELY ACTIVE |
| ISIrwin Seating Company - Telescopic Division | Altamont | IL | Furniture and Related Product Manufacturing337127 | 100-499 | ◐ LIKELY ACTIVE |
| IDITW Deltar Fasteners | Frankfort | IL | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| IGITW- Global Tool Unit- Libertyville | Libertyville | IL | Machinery Manufacturing333991 | 100-499 | ◐ LIKELY ACTIVE |
| ISITW Shakeproof - Elgin | Elgin | IL | Fabricated Metal Product Manufacturing332722 | 100-499 | ◐ LIKELY ACTIVE |
| ISITW Smart Components NA, Mokena | Mokena | IL | Transportation Equipment Manufacturing336360 | 100-499 | ◐ LIKELY ACTIVE |
| ISITW Smart Components N.A. Richton Park | Richton Park | IL | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| JHJabil Healthcare Chicago | Gurnee | IL | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| JPJabil Packaging Solutions | Hanover Park | IL | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| JEJacksonville East | Jacksonville | IL | Plastics and Rubber Products Manufacturing326113 | 100-499 | ◐ LIKELY ACTIVE |
| JFJacksonville Factory | Jacksonville | IL | Food Manufacturing311514 | 100-499 | ◐ LIKELY ACTIVE |
| JRJame Roll Form Products, LLC | Franklin Park | IL | Fabricated Metal Product Manufacturing332114 | 100-499 | ◐ LIKELY ACTIVE |
| JJ.L.Clark | Rockford | IL | Plastics and Rubber Products Manufacturing326112 | 100-499 | ◐ LIKELY ACTIVE |
| JDJohn Deere Cylinder Div Moline | Moline | IL | Machinery Manufacturing333995 | 100-499 | ◐ LIKELY ACTIVE |
| KBKashiv Biosciences Chicago | Chicago | IL | Chemical Manufacturing325412 | 100-499 | ◐ LIKELY ACTIVE |
| KKKensing - Kankakee | Kankakee | IL | Chemical Manufacturing325613 | 100-499 | ◐ LIKELY ACTIVE |
| KIKent, IL | Kent | IL | Food Manufacturing311513 | 100-499 | ◐ LIKELY ACTIVE |
| KPKent Precision Foods Group-Bolingbrook | Bolingbrook | IL | Food Manufacturing311999 | 100-499 | ◐ LIKELY ACTIVE |
| KMKerry Melrose Park | Melrose Park | IL | Food Manufacturing311812 | 100-499 | ◐ LIKELY ACTIVE |
| KWKey West Metal Industries Incorporated-Illinois | Crestwood | IL | Fabricated Metal Product Manufacturing332322 | 100-499 | ◐ LIKELY ACTIVE |
| KKilbourn | Kilbourn | IL | Food Manufacturing311225 | 100-499 | ◐ LIKELY ACTIVE |
| KGKilcoy Global Foods/ Ruprecht | Mundelein | IL | Food Manufacturing311612 | 100-499 | ◐ LIKELY ACTIVE |
| KKkm | Mattoon | IL | Food Manufacturing311111 | 100-499 | ◐ LIKELY ACTIVE |
| KEKnapheide Equipment Company - N. 5th St Installation Center | Quincy | IL | Transportation Equipment Manufacturing336211 | 100-499 | ◐ LIKELY ACTIVE |
| KFKoch Foods - Franklin Park | Franklin Park | IL | Food Manufacturing311615 | 100-499 | ◐ LIKELY ACTIVE |
| KHKraft Heinz Co | Woodstock | IL | Food Manufacturing311421 | 100-499 | ◐ LIKELY ACTIVE |
| LILaGrange IL Engine Plant EMD | LaGrange | IL | Transportation Equipment Manufacturing336510 | 100-499 | ◐ LIKELY ACTIVE |
| LILaGrange IL Engine Plant EMD | La Grange | IL | Transportation Equipment Manufacturing336510 | 100-499 | ◐ LIKELY ACTIVE |
| LSLaura Sprague School | Lincolnshire | IL | Furniture and Related Product Manufacturing337127 | 100-499 | ◐ LIKELY ACTIVE |
| LBLeica Biosystems | Deer Park | IL | Computer and Electronic Product Manufacturing334516 | 100-499 | ◐ LIKELY ACTIVE |