| LPLiberty Packaging - Quad Cities, IL | Rock Island | IL | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| LLiquibox/Sealedair-Romeoville | Romeoville | IL | Plastics and Rubber Products Manufacturing326111 | 100-499 | ◐ LIKELY ACTIVE |
| LPLoves Park | Loves Park | IL | Food Manufacturing311821 | 100-499 | ◐ LIKELY ACTIVE |
| LLLuminex LCH | Northbrook | IL | Chemical Manufacturing325413 | 100-499 | ◐ LIKELY ACTIVE |
| LMLyondellbasell Morris Site | Morris | IL | Chemical Manufacturing325211 | 100-499 | ◐ LIKELY ACTIVE |
| MPMachesney Park | Caledonia | IL | Food Manufacturing311919 | 100-499 | ◐ LIKELY ACTIVE |
| MMain | Mccook | IL | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| MPMaker's Pride Wenona | Wenona | IL | Food Manufacturing311821 | 100-499 | ◐ LIKELY ACTIVE |
| MTManchester Tank & Equipment- Quincy | Quincy | IL | Fabricated Metal Product Manufacturing332420 | 100-499 | ◐ LIKELY ACTIVE |
| MCMCC Corporate | Rosemont | IL | Printing and Related Support Activities323111 | 100-499 | ◐ LIKELY ACTIVE |
| MDMCC Division FB US | Elk Grove | IL | Printing and Related Support Activities323111 | 100-499 | ◐ LIKELY ACTIVE |
| MGMcCormick Geneva | Geneva | IL | Food Manufacturing311930 | 100-499 | ◐ LIKELY ACTIVE |
| MIMcHenry, IL - Pallet Plant - 337 | Richmond | IL | Wood Product Manufacturing321920 | 100-499 | ◐ LIKELY ACTIVE |
McLaughlin Body Company - Rock Island | Rock Island | IL | Machinery Manufacturing333111 | 100-499 | ◐ LIKELY ACTIVE |
| MWMEC - Wheeling | Wheeling | IL | Fabricated Metal Product Manufacturing332999 | 100-499 | ◐ LIKELY ACTIVE |
| MMMedical Murray Lake Zurich | Lake Zurich | IL | Miscellaneous Manufacturing339112 | 100-499 | ◐ LIKELY ACTIVE |
| MMendota | Mendota | IL | Plastics and Rubber Products Manufacturing326122 | 100-499 | ◐ LIKELY ACTIVE |
| MLMetform LLC Hotform | Savanna | IL | Transportation Equipment Manufacturing336350 | 100-499 | ◐ LIKELY ACTIVE |
| MLMetform LLC / Machined Components 1 | Savanna | IL | Transportation Equipment Manufacturing336350 | 100-499 | ◐ LIKELY ACTIVE |
| MMetropolis-HSEMS | Metropolis | IL | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| MPMiddleby Packaging Solutions - Elgin | Elgin | IL | Machinery Manufacturing333993 | 100-499 | ◐ LIKELY ACTIVE |
| MIMillwood, Inc. Melrose Park | Melsrose Park | IL | Wood Product Manufacturing321920 | 100-499 | ◐ LIKELY ACTIVE |
| MLMitsubishi Logisnext Americas Marengo | Marengo | IL | Machinery Manufacturing333924 | 100-499 | ◐ LIKELY ACTIVE |
| MIMittera IL LLC | Berkeley | IL | Printing and Related Support Activities323111 | 100-499 | ◐ LIKELY ACTIVE |
| MMMolex - Monee, IL | Monee | IL | Electrical Equipment, Appliance & Component Manufacturing335931 | 100-499 | ◐ LIKELY ACTIVE |
| MGMondelez Global, LLC Naperville Plant | Naperville | IL | Food Manufacturing311821 | 100-499 | ◐ LIKELY ACTIVE |
| MRMondi Romeoville LLC | Romeoville | IL | Paper Manufacturing322220 | 100-499 | ◐ LIKELY ACTIVE |
| MSMotorola Solutions Inc | Schaumburg | IL | Computer and Electronic Product Manufacturing334220 | 100-499 | ◐ LIKELY ACTIVE |
| MEMSI Express - West Chicago | West Chicago | IL | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
MTM Recognition | Princeton | IL | Miscellaneous Manufacturing339910 | 100-499 | ◐ LIKELY ACTIVE |
| MWMueller Water Products | Decatur | IL | Fabricated Metal Product Manufacturing332911 | 100-499 | ◐ LIKELY ACTIVE |
| MCMW - Cicero | Chicago | IL | Food Manufacturing311991 | 100-499 | ◐ LIKELY ACTIVE |
| MLMwcpa LLC | Skokie | IL | Apparel Manufacturing315990 | 100-499 | ◐ LIKELY ACTIVE |
| NCNal Corporate Headquarters | Paris | IL | Transportation Equipment Manufacturing336320 | 100-499 | ◐ LIKELY ACTIVE |
| NLNaperville Location | Naperville | IL | Electrical Equipment, Appliance & Component Manufacturing335921 | 100-499 | ◐ LIKELY ACTIVE |
| NINascote Industries - Mockingbird Road | Nashville | IL | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
| NMNascote - Mockingbird Road 2 | Nashville | IL | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
| NMNidec Mobility of America Corporation | St. Charles | IL | Transportation Equipment Manufacturing336320 | 100-499 | ◐ LIKELY ACTIVE |
| NMNidec Mobility of America Corporation | Saint Charles | IL | Transportation Equipment Manufacturing336320 | 100-499 | ◐ LIKELY ACTIVE |
| NVNielsen-Massey Vanillas Inc. | Waukegan | IL | Food Manufacturing311942 | 100-499 | ◐ LIKELY ACTIVE |
| NANorth America Rantoul | Rantoul | IL | Wood Product Manufacturing321911 | 100-499 | ◐ LIKELY ACTIVE |
| NCNorthlake Container | Northlake | IL | Paper Manufacturing322211 | 100-499 | ◐ LIKELY ACTIVE |
| NNNosco-Gurnee North | Gurnee | IL | Printing and Related Support Activities323111 | 100-499 | ◐ LIKELY ACTIVE |
| NFNOW Foods - Corporate | Bloomingdale | IL | Food Manufacturing311999 | 100-499 | ◐ LIKELY ACTIVE |
| NCNSA Chicago | Chicago | IL | Apparel Manufacturing315220 | 100-499 | ◐ LIKELY ACTIVE |
| NNutrivo | Aurora | IL | Food Manufacturing311999 | 100-499 | ◐ LIKELY ACTIVE |
| NINu-Way Industries, Inc. | Elk Grove Village | IL | Fabricated Metal Product Manufacturing332322 | 100-499 | ◐ LIKELY ACTIVE |
| OGOpen Gate | Forest Park | IL | Plastics and Rubber Products Manufacturing326299 | 100-499 | ◐ LIKELY ACTIVE |
| OWOperations Washington IL | Washington | IL | Fabricated Metal Product Manufacturing332119 | 100-499 | ◐ LIKELY ACTIVE |
| OOOptimas OE Solutions Holdings, LLC | Wood Dale | IL | Fabricated Metal Product Manufacturing332722 | 100-499 | ◐ LIKELY ACTIVE |