| JCJohn Crane, INC | Morton Grove | IL | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
| JDJohn Deere Harvester Works | East Moline | IL | Machinery Manufacturing333111 | 500+ | ● ACTIVE |
| JDJohn Deere Seeding Group | Moline | IL | Machinery Manufacturing333111 | 100-499 | ● ACTIVE |
| JHJohn Hofmeister & Son INC | Chicago | IL | Food Manufacturing311612 | 100-499 | ● ACTIVE |
Jsn INC | Maywood | IL | Fabricated Metal Product Manufacturing332618 | 1-19 | ● ACTIVE |
J. T. Cullen CO INC | Fulton | IL | Fabricated Metal Product Manufacturing332312 | 20-99 | ● ACTIVE |
| JRJune R R Nichols Ocularist LTD | Des Plaines | IL | Miscellaneous Manufacturing339115 | 1-19 | ● ACTIVE |
Kaney Aerospace, INC. | Rockford | IL | Computer and Electronic Product Manufacturing334220 | — | ● ACTIVE |
| KMKarnak Midwest LLC | Broadview | IL | Petroleum and Coal Products Manufacturing324122 | 20-99 | ● ACTIVE |
Kaskaskia Tool and Machine, INC | New Athens | IL | Fabricated Metal Product Manufacturing332710 | 20-99 | ● ACTIVE |
Kastalon INC | Alsip | IL | Chemical Manufacturing325211 | 20-99 | ● ACTIVE |
| KOKeating of Chicago INC | Mc Cook | IL | Machinery Manufacturing333310 | 20-99 | ● ACTIVE |
Kepner Products CO | Villa Park | IL | Fabricated Metal Product Manufacturing332912 | 20-99 | ● ACTIVE |
Kifco, INC | Havana | IL | Machinery Manufacturing333111 | 20-99 | ● ACTIVE |
| KPKksp Precision Machining LLC | Glendale Heights | IL | Fabricated Metal Product Manufacturing332710 | 20-99 | ● ACTIVE |
Kold-ban International LTD | Lake in the Hills | IL | Machinery Manufacturing333618 | 20-99 | ● ACTIVE |
Koval INC. | Chicago | IL | Beverage and Tobacco Product Manufacturing312140 | 1-19 | ● ACTIVE |
| KCKress CORP | Brimfield | IL | Machinery Manufacturing333120 | 100-499 | ● ACTIVE |
Kvf-quad, Corporation | East Moline | IL | Primary Metal Manufacturing331221 | 20-99 | ● ACTIVE |
Laboratory Growth & Productivity Consulting INC | Wood River | IL | Miscellaneous Manufacturing339113 | 1-19 | ● ACTIVE |
La Frenz Pattern Company, Incorporated | Moline | IL | Machinery Manufacturing333514 | 1-19 | ● ACTIVE |
Lake County Press INC | Waukegan | IL | Printing and Related Support Activities323111 | 100-499 | ● ACTIVE |
Land Air Sea Systems INC | Woodstock | IL | Computer and Electronic Product Manufacturing334220 | 20-99 | ● ACTIVE |
| LOLand O' Frost Lansing | Lansing | IL | Food Manufacturing311611 | 100-499 | ● ACTIVE |
Lang Dental Manufacturing CO INC | Wheeling | IL | Miscellaneous Manufacturing339114 | — | ● ACTIVE |
| LTLaser Technologies INC | Naperville | IL | Electrical Equipment, Appliance & Component Manufacturing335999 | 20-99 | ● ACTIVE |
| LMLb Metals LLC | Harvey | IL | Fabricated Metal Product Manufacturing332312 | 100-499 | ● ACTIVE |
| LPLeisure Properties LLC D/b/a Crownline Boats | West Frankfort | IL | Transportation Equipment Manufacturing336612 | 20-99 | ● ACTIVE |
Liftseat CORP | Oak Brook | IL | Fabricated Metal Product Manufacturing332913 | 1-19 | ● ACTIVE |
| LALincolnland Agri-energy LLC | Palestine | IL | Chemical Manufacturing325193 | 20-99 | ● ACTIVE |
| LELodan Electronics INC | Arlington Heights | IL | Computer and Electronic Product Manufacturing334419 | 1-19 | ● ACTIVE |
Lovejoy, LLC | Downers Grove | IL | Machinery Manufacturing333613 | — | ● ACTIVE |
Lund Industries, INC | Northbrook | IL | Computer and Electronic Product Manufacturing334290 | 20-99 | ● ACTIVE |
| LWL. W. Schneider, INC | Princeton | IL | Fabricated Metal Product Manufacturing332710 | 100-499 | ● ACTIVE |
Lyon & Healy Harps INC | Chicago | IL | Miscellaneous Manufacturing339992 | 100-499 | ● ACTIVE |
| LLLyon LLC | Montgomery | IL | Furniture and Related Product Manufacturing337215 | 100-499 | ● ACTIVE |
M-1 Tool Works, INC. | Mchenry | IL | Fabricated Metal Product Manufacturing332710 | 20-99 | ● ACTIVE |
| MMMaclean Mallard LLC | Sterling | IL | Machinery Manufacturing333922 | 100-499 | ● ACTIVE |
Magid Glove and Safety Manufacturing Company, L.l.c. | Romeoville | IL | Apparel Manufacturing315990 | 500+ | ● ACTIVE |
Magnetic Inspection Laboratory, INC | Elk Grove Village | IL | Fabricated Metal Product Manufacturing332812 | 100-499 | ● ACTIVE |
| MIMagnetrol International INC | Aurora | IL | Computer and Electronic Product Manufacturing334513 | 100-499 | ● ACTIVE |
Magnum Machining LLC | Richmond | IL | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
Mah Machine Company | Cicero | IL | Fabricated Metal Product Manufacturing332710 | 20-99 | ● ACTIVE |
Manor Tool & Manufacturing CO | Schiller Park | IL | Fabricated Metal Product Manufacturing332116 | 20-99 | ● ACTIVE |
Marathon Cutting Die INC | Wheeling | IL | Fabricated Metal Product Manufacturing332710 | 20-99 | ● ACTIVE |
Marlboro Wire, Limited | Quincy | IL | Fabricated Metal Product Manufacturing332618 | 20-99 | ● ACTIVE |
| MCMasterbrand Cabinets INC | Arthur | IL | Furniture and Related Product Manufacturing337110 | 500+ | ● ACTIVE |
| MSMaterial Sciences CORP | Elk Grove Village | IL | Fabricated Metal Product Manufacturing332812 | 20-99 | ● ACTIVE |
Matrix Plastic Products INC | Wood Dale | IL | Plastics and Rubber Products Manufacturing326199 | 100-499 | ● ACTIVE |
Mbl (usa) Corporation | Ottawa | IL | Plastics and Rubber Products Manufacturing326220 | 100-499 | ● ACTIVE |