| MEMathis Excavating | Du Quoin | — | ◇ UNVERIFIED |
| MLMatt Leigh | Pontiac | — | ◇ UNVERIFIED |
| MPMchenry Public Works Garage | Mchenry | — | ◇ UNVERIFIED |
| MIMeadowvale INC | Sandwich | — | ◇ UNVERIFIED |
| MTMedline Teleflex Medical | Arlington Heights | — | ◇ UNVERIFIED |
| MFMedora Fs, INC. | Medora | — | ◇ UNVERIFIED |
| MLMedranos Landscape INC | Rockford | — | ◇ UNVERIFIED |
| MTMeioco Terminal | Ashkum | — | ◇ UNVERIFIED |
| MIMerkle-korff Industries- Plant 3 | Des Plaines | — | ◇ UNVERIFIED |
| MAMerryman Aggregates | Harvard | — | ◇ UNVERIFIED |
| MAMerryman Aggregates LLC | Woodstock | — | ◇ UNVERIFIED |
| MEMerryman Excavation INC | Woodstock | — | ◇ UNVERIFIED |
| MMMetal Management Midwest INC | Bedford Park | — | ◇ UNVERIFIED |
| MTMetrolink Transit | Rock Island | — | ◇ UNVERIFIED |
| MAMetropolis Airport | Metropolis | — | ◇ UNVERIFIED |
| MPMetropolitan Pier & Exposition Authority | Chicago | — | ◇ UNVERIFIED |
| MMMeyer Materials CO | Crystal Lake | — | ◇ UNVERIFIED |
| MAMid America Sand & Gravel CO | Mahomet | — | ◇ UNVERIFIED |
| MAMid America Sand & Gravel CO | Champaign | — | ◇ UNVERIFIED |
| MAMidway Airport Amc Buildings | Chicago | — | ◇ UNVERIFIED |
| MCMidwest Cement Products | Woosung | — | ◇ UNVERIFIED |
| MEMidwest Electronic | Ellsworth | — | ◇ UNVERIFIED |
| MRMidwest Rem Enterprises INC | Chicago | — | ◇ UNVERIFIED |
| MSMidwest Sanitary Service INC | Wood River | — | ◇ UNVERIFIED |
| MSMidwest Soil Remediation | Lockport | — | ◇ UNVERIFIED |
| MTMidwest Trophy Manufacturing CO | Princeton | — | ◇ UNVERIFIED |
| MFMike Fuhrman, Village President | Waynesville | — | ◇ UNVERIFIED |
| MRMilam Recycling & Disposal | East Saint Louis | — | ◇ UNVERIFIED |
| MMMinee Monesse Golf Course | Momence | — | ◇ UNVERIFIED |
| MLMixonsite LLC | Chicago | — | ◇ UNVERIFIED |
| MLM & L Oil CO INC | Cisne | — | ◇ UNVERIFIED |
| MPMoore Painting CO | Alton | — | ◇ UNVERIFIED |
| MCMorris Community Landfill | Morris | — | ◇ UNVERIFIED |
| MGMorrison Grease Recycling INC | Morrison | — | ◇ UNVERIFIED |
| MSMorton Supplies INC | Morton | — | ◇ UNVERIFIED |
| MTMpl Technologies INC | Franklin Park | — | ◇ UNVERIFIED |
| MPMrc Polymers INC | Chicago | — | ◇ UNVERIFIED |
| MRM&r Rubber CO | Belvidere | — | ◇ UNVERIFIED |
| MPMt Prospect Mail Pharmacy | Mount Prospect | — | ◇ UNVERIFIED |
| MCMulch Center the | North Chicago | — | ◇ UNVERIFIED |
| MCMulti / County Landfill | Villa Grove | — | ◇ UNVERIFIED |
| MDMusser Division-selmer CO INC | La Grange | — | ◇ UNVERIFIED |
| NCNational Chemical | Plainfield | — | ◇ UNVERIFIED |
| NGNatural Gas Pipeline CO of America | Chicago Heights | — | ◇ UNVERIFIED |
| NGNatural Gas Pipeline CO Station 206a | Altamont | — | ◇ UNVERIFIED |
| NCNeri Contractors & Excavators INC | Lake in the Hills | — | ◇ UNVERIFIED |
| NCNestle Clinical Nutrition | Hopkins Park | — | ◇ UNVERIFIED |
| NCNichem CORP | Chicago | — | ◇ UNVERIFIED |
| NTNoah's Trading Post | Rockford | — | ◇ UNVERIFIED |
| NCNorco Cleaners INC | Dolton | — | ◇ UNVERIFIED |
