| H3Hillside 3 | Hillside | IL | Transportation Equipment Manufacturing336350 | 100-499 | ◐ LIKELY ACTIVE |
| IAIllinois Auto Electric Co. (IAEPP) | Naperville | IL | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| I9Impex 9 INC | Naperville | IL | Transportation Equipment Manufacturing336412 | — | ◐ LIKELY ACTIVE |
| IBIMS Buhrke-Olson | Arlington Heights | IL | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
| IAITW Automotive Body and Fuel NA, Frankfort, IL | Frankfort | IL | Transportation Equipment Manufacturing336360 | 20-99 | ◐ LIKELY ACTIVE |
| ISITW Smart Components NA, Mokena | Mokena | IL | Transportation Equipment Manufacturing336360 | 100-499 | ◐ LIKELY ACTIVE |
| JHJasmine Hunter | Normal | IL | Transportation Equipment Manufacturing336310 | — | ◐ LIKELY ACTIVE |
| JKJeffrey Kerley | Herrin | IL | Transportation Equipment Manufacturing336211 | — | ◐ LIKELY ACTIVE |
| KAKay and Associates, INC. | Buffalo Grove | IL | Transportation Equipment Manufacturing336411 | — | ◐ LIKELY ACTIVE |
| KEKnapheide Equipment CO - Chicago | Mchenry | IL | Transportation Equipment Manufacturing336211 | 20-99 | ◐ LIKELY ACTIVE |
| KEKnapheide Equipment Company - N. 5th St Installation Center | Quincy | IL | Transportation Equipment Manufacturing336211 | 100-499 | ◐ LIKELY ACTIVE |
| KMKnapheide Manufacturing Training Facility | Quincy | IL | Transportation Equipment Manufacturing336211 | 20-99 | ◐ 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 |
| LILashcon INC | Winchester | IL | Transportation Equipment Manufacturing336212 | — | ◐ LIKELY ACTIVE |
| MJMeridian Jetpack INC | Chicago | IL | Transportation Equipment Manufacturing336411 | — | ▲ REPORTED CLOSED |
| MLMetform LLC Hotform | Savanna | IL | Transportation Equipment Manufacturing336350 | 100-499 | ◐ LIKELY ACTIVE |
| MLMetform LLC / Machined Components | Mt. Carroll | IL | Transportation Equipment Manufacturing336350 | 20-99 | ◐ LIKELY ACTIVE |
| MLMetform LLC / Machined Components | Mount Carroll | IL | Transportation Equipment Manufacturing336350 | 20-99 | ◐ LIKELY ACTIVE |
| MLMetform LLC / Machined Components 1 | Savanna | IL | Transportation Equipment Manufacturing336350 | 100-499 | ◐ LIKELY ACTIVE |
| MIMike's, Inc. | South Roxana | IL | Transportation Equipment Manufacturing336611 | 20-99 | ◐ LIKELY ACTIVE |
| MTMilitary Truck Works LLC | Mundelein | IL | Transportation Equipment Manufacturing336110 | — | ◐ LIKELY ACTIVE |
| MMitchell | Mitchell | IL | Transportation Equipment Manufacturing336330 | 20-99 | ◐ LIKELY ACTIVE |
| MPMpc Products Corporation | Niles | IL | Transportation Equipment Manufacturing336413 | — | ◐ LIKELY ACTIVE |
| MMMrdc Minooka, Rdc | Minooka | IL | Transportation Equipment Manufacturing336111 | 20-99 | ◐ LIKELY ACTIVE |
| MJMTE Joliet | Joliet | IL | Transportation Equipment Manufacturing336211 | 20-99 | ◐ LIKELY ACTIVE |
| NCNal Corporate Headquarters | Paris | IL | Transportation Equipment Manufacturing336320 | 100-499 | ◐ LIKELY ACTIVE |
| NINal Illinois Equipment Plant | Flora | IL | Transportation Equipment Manufacturing336320 | 20-99 | ◐ LIKELY ACTIVE |
| NMNal Mattoon Service Plant | Mattoon | IL | Transportation Equipment Manufacturing336320 | 20-99 | ◐ LIKELY ACTIVE |
| NPNal Paris Plant | Paris | IL | Transportation Equipment Manufacturing336320 | 500+ | ◐ LIKELY ACTIVE |
| NSNal Salem Plant | Salem | IL | Transportation Equipment Manufacturing336320 | 500+ | ◐ LIKELY ACTIVE |
| NINascote Industries - Mockingbird 3 | Nashville | IL | Transportation Equipment Manufacturing336390 | 1-19 | ◐ 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 |
| NMNRE Mt. Vernon | Mount Vernon | IL | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| NSNRE Silvis | Silvis | IL | Transportation Equipment Manufacturing336510 | 1-19 | ◐ LIKELY ACTIVE |
| ONOakley - Normal | Normal | IL | Transportation Equipment Manufacturing336390 | 1-19 | ◐ LIKELY ACTIVE |
| PPeoria | Peoria | IL | Transportation Equipment Manufacturing336212 | 20-99 | ◐ LIKELY ACTIVE |
| PAPursuit Aerospace | Morton | IL | Transportation Equipment Manufacturing336412 | 20-99 | ◐ LIKELY ACTIVE |
| QTQualiseal Technology a Technetics Group Company | Harwood Heights | IL | Transportation Equipment Manufacturing336412 | 20-99 | ◐ LIKELY ACTIVE |
| RTRail Tech Leasing & Manufacturing | University Park | IL | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| SSSia Schaumburg, Il-aftersales | Schaumburg | IL | Transportation Equipment Manufacturing336111 | 20-99 | ◐ LIKELY ACTIVE |
| SLSkywall LLC | Oak Brook | IL | Transportation Equipment Manufacturing336411 | — | ◐ LIKELY ACTIVE |
| SCSRAM - Chicago HQ | Chicago | IL | Transportation Equipment Manufacturing336991 | 100-499 | ◐ LIKELY ACTIVE |
| STStandfast Tram LLC | Chicago | IL | Transportation Equipment Manufacturing336390 | — | ◐ LIKELY ACTIVE |
| SFStok Federal Services, LLC | Marion | IL | Transportation Equipment Manufacturing336110 | — | ◐ LIKELY ACTIVE |
| TMTCCI Manufacturing | Decatur | IL | Transportation Equipment Manufacturing336390 | 100-499 | ◐ LIKELY ACTIVE |
| TVThales Visionix, Inc. | Aurora | IL | Transportation Equipment Manufacturing336413 | 20-99 | ◐ LIKELY ACTIVE |