| NANorthern Adhesives, INC. | Maspeth | NY | — | ◇ UNVERIFIED |
| NINorthern Industries | Coventry | RI | — | ◇ UNVERIFIED |
| NFNorthway Fuel LLC | Yonkers | NY | — | ◇ UNVERIFIED |
| NPNorthwestern Plating Works | Chicago | IL | — | ◇ UNVERIFIED |
| NVNorwalk Village CORP | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| NINorwesco, INC. | Hanford | CA | — | ◇ UNVERIFIED |
| NINorwest Ingredients LLC Royal City | Royal City | WA | — | ◇ UNVERIFIED |
| NCNo-strip Chemical | Commerce City | CO | — | ◇ UNVERIFIED |
| NDNotre Dame Investors INC - Jennings Refinery | Jennings | LA | — | ◇ UNVERIFIED |
| NCNottingham Company | Atlanta | GA | — | ◇ UNVERIFIED |
| NCNouryon Chemicals LLC | Mays Landing | NJ | — | ◇ UNVERIFIED |
| NFNouryon Functional Chemicals Burt Plant | Burt | NY | — | ◇ UNVERIFIED |
| NPNouryon Pulp & Performance Chemicals | Duluth | GA | — | ◇ UNVERIFIED |
| NSNouryon Surface Chemistry LLC | Salisbury | NC | — | ◇ UNVERIFIED |
| NLNovacco LLC | Oceanside | CA | — | ◇ UNVERIFIED |
| NCNova Chemicals | Channahon | IL | — | ◇ UNVERIFIED |
| NCNova Chemicals INC | Indian Orchard | MA | — | ◇ UNVERIFIED |
| NCNova Chemicals INC | Belpre | OH | — | ◇ UNVERIFIED |
| NCNovacor Chemical INC | Leominster | MA | — | ◇ UNVERIFIED |
| NENova Enterprises | Arden | NC | — | ◇ UNVERIFIED |
| NPNova Pressroom Products | Jacksonville | FL | — | ◇ UNVERIFIED |
| NLNovipax LLC | Reading | PA | — | ◇ UNVERIFIED |
| NINovoloop INC | Menlo Park | CA | — | ◇ UNVERIFIED |
| NBNovozymes Biologicals INC - South Broad Street | Salem | VA | — | ◇ UNVERIFIED |
| NANufarm Americas INC | Chicago Heights | IL | — | ◇ UNVERIFIED |
| NLNumake-2 LLC of Mn | Little Falls | MN | — | ◇ UNVERIFIED |
| NSNupak Solutions, INC. | Muskegon | MI | — | ◇ UNVERIFIED |
| NCNupla Corporation | Sun Valley | CA | — | ◇ UNVERIFIED |
| NINuset Industries, Orrco, 02 Bl (nuseti) | Salt Lake City | UT | — | ◇ UNVERIFIED |
| NLNustar Logistics L P | Pittsburg | CA | — | ◇ UNVERIFIED |
| NPNuvida Plastic Technology | Edison | NJ | — | ◇ UNVERIFIED |
| NWNu Wood Design | Lake Forest | CA | — | ◇ UNVERIFIED |
| NLNuzelmeyer LLC | Bear | DE | — | ◇ UNVERIFIED |
| NFNwpmg00002 Former Texaco Sunburst Works | Sunburst | MT | — | ◇ UNVERIFIED |
| NRNxtgen Resins LLC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| NPNyacol Products Incorporated | Ashland | MA | — | ◇ UNVERIFIED |
 Nycote Laboratories CORP | North Hollywood | CA | — | ◇ UNVERIFIED |
| NGNzt Group | Sacramento | CA | — | ◇ UNVERIFIED |
| OCOak-bark CORP | Riegelwood | NC | — | ◇ UNVERIFIED |
| OEOak Engineered Products, INC. | Canonsburg | PA | — | ◇ UNVERIFIED |
| OCOatey CO | Newark | CA | — | ◇ UNVERIFIED |
| OFOberon Fuels Kershaw Facility | Brawley | CA | — | ◇ UNVERIFIED |
| OObiter | Champaign | IL | — | ◇ UNVERIFIED |
| OCObsidian Chemical Solutions LLC | Midland | TX | — | ◇ UNVERIFIED |
| OCOccidental Chemical CORP | Pottstown | PA | — | ◇ UNVERIFIED |
| OROcean Reef Pools INC. | Oak Hill | FL | — | ◇ UNVERIFIED |
| OEOctal Extrusion Corporation | West Chester | OH | — | ◇ UNVERIFIED |
| OTOdessa Terminal | Odessa | TX | — | ◇ UNVERIFIED |
| OIOemeta INC. | Salt Lake City | UT | — | ◇ UNVERIFIED |
| OPOffen Petroleum INC | Commerce City | CO | — | ◇ UNVERIFIED |
| ODOffsite Demolition Charlton Pollard Neighborhood | Beaumont | TX | — | ◇ UNVERIFIED |
| OSOilfield Solutions Midland | Midland | TX | — | ◇ UNVERIFIED |
| OTOiltanking Texas City Terminal | Texas City | TX | — | ◇ UNVERIFIED |
| OIOkon INC | Lakewood | CO | — | ◇ UNVERIFIED |
| OMOld Monroe Rd Facility | Athens | GA | — | ◇ UNVERIFIED |
| OWOld Water Holdings, LLC | Wedowee | AL | — | ◇ UNVERIFIED |
| O3Olein 3 Green Valley Industrial Park | Yabucoa | PR | — | ◇ UNVERIFIED |
| OROlein Recovery CORP | Yabucoa | PR | — | ◇ UNVERIFIED |
| OFOligo Factory INC | Holliston | MA | — | ◇ UNVERIFIED |
| OCOlin CORP - Moundsville Plant | Moundsville | WV | — | ◇ UNVERIFIED |
| OROlin Rd Crude Butadiene Ms Mc 43 44 | Beaumont | TX | — | ◇ UNVERIFIED |
| OBOlive Bio LLC Dba Olviebio | Inglewood | CA | — | ◇ UNVERIFIED |
| OCOliver Chemical CO INC | Cincinnati | OH | — | ◇ UNVERIFIED |
| OCOlson Companies, INC. | West Fork | AR | — | ◇ UNVERIFIED |
| OCOlympic Chemical CORP | Tacoma | WA | — | ◇ UNVERIFIED |
| OTOmaha Transloading Corporation | Omaha | NE | — | ◇ UNVERIFIED |
| OEOmega Extruding CORP of Ca | Compton | CA | — | ◇ UNVERIFIED |
| OHOmega Henderson Terminal | Henderson | KY | — | ◇ UNVERIFIED |
| OEOmg Electronic Chemicals | South Plainfield | NJ | — | ◇ UNVERIFIED |
| OBOmni Bioenergy LLC | Granite City | IL | — | ◇ UNVERIFIED |
| OIOmni Industrial Solutions, INC | Longview | TX | — | ◇ UNVERIFIED |
| OSOmnova Solutions INC | Calhoun | GA | — | ◇ UNVERIFIED |
| OSOmnova Solutions INC. | Akron | OH | — | ◇ UNVERIFIED |
| OSOmnova Solutions, INC. | Dalton | GA | — | ◇ UNVERIFIED |
| OSOmnova Solutions INC. - Calhoun Latex Plant | Calhoun | GA | — | ◇ UNVERIFIED |
| OSOmya Specialty Materials | Long Beach | CA | — | ◇ UNVERIFIED |
| ONOndeo Nalco CO | Ellwood City | PA | — | ◇ UNVERIFIED |
| OBOneh2 Burbank Site | Burbank | CA | — | ◇ UNVERIFIED |
| OLOneh2 Long Beach Site | Long Beach | CA | — | ◇ UNVERIFIED |
| OHOneok Hydrocarbon - Mcpherson Butane Isom (flare)(air) | Mcpherson | KS | — | ◇ UNVERIFIED |
| OUOne Up Mfg 3 | Gardena | CA | — | ◇ UNVERIFIED |
| OOnscent/norwood | Norwood | NJ | — | ◇ UNVERIFIED |
| O7Ontario 76 | Ontario | CA | — | ◇ UNVERIFIED |
| OGOpal Gas Plant | Lincoln | WY | — | ◇ UNVERIFIED |
| OBOpen Book Extracts | Roxboro | NC | — | ◇ UNVERIFIED |
| ODOpen Door Packaging | Chino | CA | — | ◇ UNVERIFIED |
| OMOrasis Medical | Laguna Hills | CA | — | ◇ UNVERIFIED |
| OBOregon Basin Gas Plant | Cody | WY | — | ◇ UNVERIFIED |
| OBOregon Basin - Polyacrylamide Plant | Park | WY | — | ◇ UNVERIFIED |
| OBOregon Basin - Polyacrylamide Plant (merit Energy Company) | Cody | WY | — | ◇ UNVERIFIED |
| OSOrenco Systems | Roseburg | OR | — | ◇ UNVERIFIED |
 Organic Dyes and Pigments | Providence | RI | — | ◇ UNVERIFIED |
| OGOrica Ground Support | Grand Junction | CO | — | ◇ UNVERIFIED |
| OBOriginal Balboa Caregivers INC | Chatsworth | CA | — | ◇ UNVERIFIED |
| OBOrigin Baltimore Recycling, LLC | Curtis Bay | MD | — | ◇ UNVERIFIED |
| OSOrion Safety Products | Peru | IN | — | ◇ UNVERIFIED |
| OBOsprey Biotechnics | Sarasota | FL | — | ◇ UNVERIFIED |
| OEO'Tech East, LLC | Auburn | MA | — | ◇ UNVERIFIED |
| OAOxbow Activated Carbon LLC | Emlenton | PA | — | ◇ UNVERIFIED |
| OIOxford Immunotec USA Marlborough | Marlborough | MA | — | ◇ UNVERIFIED |
