| MOMartin Oil of Indiana 709 | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MCMaster Casting and CAD | Chicago | IL | Miscellaneous Manufacturing339910 | — | ◇ UNVERIFIED |
| MWMccormick West Constructors LLC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MLMelpap LTD Dba Cm Morton | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MAMetro Auto Tech United | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MEMico Express | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MIMidland Industries INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MGMidway Gas Service INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MGMidwest Generation LLC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MMMiles Mcneel Design inc. | Chicago | IL | Miscellaneous Manufacturing339910 | — | ◇ UNVERIFIED |
| MVMjd Ventures LLC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MEMks Energies INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MMobil | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MMobil | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MMMonami Mobil 2 | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MPMps Paper Tube & Can | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MIMw Ii INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NDNakamon Design LLC | Chicago | IL | Miscellaneous Manufacturing339910 | — | ◇ UNVERIFIED |
| NINavistar, INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NANeon Art Llc | Chicago | IL | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| NDNetrality Data Center | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NJN Jaravelil Petroleum | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NMNoor Mart INC Bp | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NANorth America Stevedoring CO (nasco) | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NHNorth & Harlem | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NGN&p Group INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NTNumat Technologies | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OLOak Lawn Svc | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OMOgden Minuteman Citgo - Ogden Amstar | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OAOhare Airport | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OGOk Gas & Food Mart | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OAOmega Autotech INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OIOmega Iii LLC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OSOne Stop | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OTOn Taps LTD. | Chicago | IL | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| OCO&s CORP | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OSO & S Dental, INC. | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| OMOzinga Materials and Logistics | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| PIPbss INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| P6Phillips 66 | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| PSPhil & Sons | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| PCPlote Const INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| PPPolyair Packaging CORP | Chicago | IL | Paper Manufacturing322221 | — | ◇ UNVERIFIED |
| PGPower Gas | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| PAPramukh Auto Services INC Dba Maaco Auto Paint & Collision | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| QAQ Auto Body | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| QSQuick Stop Gas | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RFRadio Flyer INC | Chicago | IL | Miscellaneous Manufacturing339930 | — | ◇ UNVERIFIED |
| RARamels Auto Svc | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RSRecycling Services INC | Chicago | IL | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |