| MAMetropolis Airport | Metropolis | IL | — | ◇ UNVERIFIED |
| MPMetropolitan Pier & Exposition Authority | Chicago | IL | — | ◇ UNVERIFIED |
| MMMeyer Materials CO | Crystal Lake | IL | — | ◇ UNVERIFIED |
| MPMiami Products & Chemical CO. | Dayton | OH | — | ◇ UNVERIFIED |
| MAMicrotron Abrasives, INC. | Pineville | NC | — | ◇ UNVERIFIED |
| MAMid America Sand & Gravel CO | Mahomet | IL | — | ◇ UNVERIFIED |
| MAMid America Sand & Gravel CO | Champaign | IL | — | ◇ UNVERIFIED |
| MRMiddleboro Recycling | Middleborough | MA | — | ◇ UNVERIFIED |
| MAMidway Airport Amc Buildings | Chicago | IL | — | ◇ UNVERIFIED |
| MCMidwest Cement Products | Woosung | IL | — | ◇ UNVERIFIED |
| MEMidwest Electronic | Ellsworth | IL | — | ◇ UNVERIFIED |
| MRMidwest Rem Enterprises INC | Chicago | IL | — | ◇ UNVERIFIED |
| MSMidwest Sanitary Service INC | Wood River | IL | — | ◇ UNVERIFIED |
| MSMidwest Soil Remediation | Lockport | IL | — | ◇ UNVERIFIED |
| MFMike Fuhrman, Village President | Waynesville | IL | — | ◇ UNVERIFIED |
| MRMilam Recycling & Disposal | East Saint Louis | IL | — | ◇ UNVERIFIED |
| MMMinee Monesse Golf Course | Momence | IL | — | ◇ UNVERIFIED |
| MRMineral Right, INC. Environmental Manager | Phillipsburg | KS | — | ◇ UNVERIFIED |
 Mini Systems Incorporated | Plainville | MA | — | ◇ UNVERIFIED |
| MVMinton Ventures, LLC | Lenoir | NC | — | ◇ UNVERIFIED |
| MPMirandy Products LLC | South Hempstead | NY | — | ◇ UNVERIFIED |
| MEMissouri Electrochem Incorporated | Saint Louis | MO | — | ◇ UNVERIFIED |
| MMMissouri Meerschaum Company | Washington | MO | — | ◇ UNVERIFIED |
| MLMixonsite LLC | Chicago | IL | — | ◇ UNVERIFIED |
| MAMizzonis Auto Body INC. | Lodi | NJ | — | ◇ UNVERIFIED |
| MLM & L Oil CO INC | Cisne | IL | — | ◇ UNVERIFIED |
| MCMonson Chemical Distribution | Leominster | MA | — | ◇ UNVERIFIED |
| MHMontec Hydraulics/carmichaels | Carmichaels | PA | — | ◇ UNVERIFIED |
| MPMoore Painting CO | Alton | IL | — | ◇ UNVERIFIED |
| MTMoorestown Twp Water Pollution Control Plant | Moorestown | NJ | — | ◇ UNVERIFIED |
| MCMorris Community Landfill | Morris | IL | — | ◇ UNVERIFIED |
| MGMorrison Grease Recycling INC | Morrison | IL | — | ◇ UNVERIFIED |
| MIMorton International | Grand Saline | TX | — | ◇ UNVERIFIED |
| MSMorton Supplies INC | Morton | IL | — | ◇ UNVERIFIED |
| MSMpower Specialty Chemicals | Brookshire | TX | — | ◇ UNVERIFIED |
| MPMrc Polymers INC | Chicago | IL | — | ◇ UNVERIFIED |
| MFMr. Foamer, INC. | Tamarac | FL | — | ◇ UNVERIFIED |
| MRM&r Rubber CO | Belvidere | IL | — | ◇ UNVERIFIED |
| MIMti Insulated Products, INC. | Fort Wayne | IN | — | ◇ UNVERIFIED |
| MPMt Prospect Mail Pharmacy | Mount Prospect | IL | — | ◇ UNVERIFIED |
| MCMulch Center the | North Chicago | IL | — | ◇ UNVERIFIED |
| MGMulti-chem Gc LLC - New Iberia Chemical Distribution Facility | New Iberia | LA | — | ◇ UNVERIFIED |
| MGMulti-chem Group LLC - Geismar Facility | Geismar | LA | — | ◇ UNVERIFIED |
| MGMulti-chem Group, LLC Rock Springs Facility | Rock Springs | WY | — | ◇ UNVERIFIED |
| MCMulti / County Landfill | Villa Grove | IL | — | ◇ UNVERIFIED |
| MFMultisorb Filtration Group, French Road Facility | Buffalo | NY | — | ◇ UNVERIFIED |
 Mustang Survival Mfg., INC. | Elizabeth | WV | — | ◇ UNVERIFIED |
 Nalco Company, Energy Services Division | Evansville | WY | — | ◇ UNVERIFIED |
| NCNalco CO Tulsa Plant 102 | Tulsa | OK | — | ◇ UNVERIFIED |
| NENalco Energy Services LP | Gillette | WY | — | ◇ UNVERIFIED |
| NSNanochem Solutions INC | Peru | IL | — | ◇ UNVERIFIED |
| NNanosys | Milpitas | CA | — | ◇ UNVERIFIED |
| NLNathan Lagin CO INC | Westbury | NY | — | ◇ UNVERIFIED |
| NCNational Chemical | Plainfield | IL | — | ◇ UNVERIFIED |
 National Foam/west Chester | West Chester | PA | — | ◇ UNVERIFIED |
| NSNational Scale Technology | Huntsville | AL | — | ◇ UNVERIFIED |
| NENatural Environmental Protection | Pomona | CA | — | ◇ UNVERIFIED |
| NGNatural Gas Pipeline CO of America | Chicago Heights | IL | — | ◇ UNVERIFIED |
| NGNatural Gas Pipeline CO Station 206a | Altamont | IL | — | ◇ UNVERIFIED |
| NDNc Dps - Johnston Paint Plant | Smithfield | NC | — | ◇ UNVERIFIED |
| NINcoc INC (national Chemical & Oil CORP ) | Oak Park | MI | — | ◇ UNVERIFIED |
| NCNeri Contractors & Excavators INC | Lake in the Hills | IL | — | ◇ UNVERIFIED |
| NCNestle Clinical Nutrition | Hopkins Park | IL | — | ◇ UNVERIFIED |
| NDNew Deal Deicing - Denver Plant | Denver | CO | — | ◇ UNVERIFIED |
| NENew England Tele | Lawrence | MA | — | ◇ UNVERIFIED |
| NJNew Jersey Fireworks | Elkton | MD | — | ◇ UNVERIFIED |
| NLNew Life Solutions, LLC | Ashland | VA | — | ◇ UNVERIFIED |
| NLNex-gen LLC | Chavies | KY | — | ◇ UNVERIFIED |
| NSNext-gen Supply Group INC | Mansfield | MA | — | ◇ UNVERIFIED |
| NCNichem CORP | Chicago | IL | — | ◇ UNVERIFIED |
| NPNiche Polymer LLC | Ravenswood | WV | — | ◇ UNVERIFIED |
| NTNoah's Trading Post | Rockford | IL | — | ◇ UNVERIFIED |
| NCNorco Cleaners INC | Dolton | IL | — | ◇ UNVERIFIED |
| NANorth American Fastener CORP | Bridgeport | WV | — | ◇ UNVERIFIED |
| NANorth American Salt CO | Chicago | IL | — | ◇ UNVERIFIED |
| NANorth American Sterilization & Packaging CO INC | Hardyston Twp | NJ | — | ◇ UNVERIFIED |
| NANorth American Stevedoring CO (formerly Ceres) | Chicago | IL | — | ◇ UNVERIFIED |
| NVNorwalk Vault | Saint Louis | MO | — | ◇ UNVERIFIED |
 Novamet Specialty Products CORP | Wyckoff | NJ | — | ◇ UNVERIFIED |
| NBNtn Bearing | Des Plaines | IL | — | ◇ UNVERIFIED |
| NNtt/verio | Chicago | IL | — | ◇ UNVERIFIED |
| NWNu Wood Design | Lake Forest | CA | — | ◇ UNVERIFIED |
| OCOakely City | Oakley | UT | — | ◇ UNVERIFIED |
| ODOakfield Development | Rockton | IL | — | ◇ UNVERIFIED |
| OPOak Park Village of | Oak Park | IL | — | ◇ UNVERIFIED |
| OROak River Cleaners | Westchester | IL | — | ◇ UNVERIFIED |
| OROak River Cleaners | Oak Park | IL | — | ◇ UNVERIFIED |
| OFOberon Fuels Kershaw Facility | Brawley | CA | — | ◇ UNVERIFIED |
| OLOctave Labs LLC | Pleasant Hill | OR | — | ◇ UNVERIFIED |
| OLOctave Labs LLC | Springfield | OR | — | ◇ UNVERIFIED |
| OIOctochem INC | Vandalia | IL | — | ◇ UNVERIFIED |
| OIOemeta INC. | Salt Lake City | UT | — | ◇ UNVERIFIED |
| OSOilfield Solutions Midland | Midland | TX | — | ◇ UNVERIFIED |
| OOldcastle | Elmer | NJ | — | ◇ UNVERIFIED |
| OSOld School Market INC | Sullivan | IL | — | ◇ UNVERIFIED |
| OGOlen G. Parkhill Owner of Kendallwood Estates | Mahomet | IL | — | ◇ UNVERIFIED |
| OCOlin CORP - Moundsville Plant | Moundsville | WV | — | ◇ UNVERIFIED |
| OAO'mara Ag Services INC | Des Moines | IA | — | ◇ UNVERIFIED |
| ODOmega Demolition CORP | Rosemont | IL | — | ◇ UNVERIFIED |
| OEOmg Electronic Chemicals | South Plainfield | NJ | — | ◇ UNVERIFIED |
