| NMNational Metalwares L.p. | Aurora | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| NNNational Northeast CORP | Lawrence | MA | Primary Metal Manufacturing331316 | — | ◇ UNVERIFIED |
| NCNational-standard Company | Corbin | KY | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| NSNat Standard-city Complex | Niles | MI | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| NINeblock INC | Rockford | IL | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| NFNeenah Foundry CO - Plants 2 and 3 | Neenah | WI | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| NANew Age Industrial CORP | Norton | KS | Primary Metal Manufacturing331316 | — | ◇ UNVERIFIED |
| NCNewark Carting INC | Newark | NJ | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| NBNew Boston Coke CORP | New Boston | OH | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| NCNew Castle Foundry/new Castle | New Castle | PA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| NRNewell Recycling of San Antonio | San Antonio | TX | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| NENew England Smelting Works INC | West Springfield | MA | Primary Metal Manufacturing331000 | — | ◇ UNVERIFIED |
| NHNew Haven Foundry | New Haven | MI | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| NPNew Products CORP | Benton Harbor | MI | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| NMNewton Mcdonald County Landfill | Neosho | MO | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| NMNexans Magnet Wire INC | La Grange | KY | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| NMNexans Magnet Wire USA Incorporated | Mexico | MO | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| NSNey Smelting & Refining CO INC | Brooklyn | NY | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| NMNgk Metals CORP | Reading | PA | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| NLNiagara Lasalle Corporation | Chattanooga | TN | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| NBNielsen & Bainbridge, LLC. | Bridgeview | IL | Plastics and Rubber Products Manufacturing326140 | — | ◇ UNVERIFIED |
| NPNl Phase 2 Residential Properties | Depew | NY | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| NFNon Ferrous Recycling | South Plainfield | NJ | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| NUNorandal USA Incorporated | Scottsboro | AL | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| NINorgren INC | Littleton | CO | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| NANorth American Die Casting CORP. | Fredericksburg | VA | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| NANorth American Steel & Wire INC | Butler | PA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| NMNorthern Marine Site | Anacortes | WA | Primary Metal Manufacturing331421 | — | ◇ UNVERIFIED |
| NANorthwest Art Casting | Milton Freewater | OR | Primary Metal Manufacturing331525 | — | ◇ UNVERIFIED |
| NANorthwest Art Casting INC | Bozeman | MT | Primary Metal Manufacturing331525 | — | ◇ UNVERIFIED |
| NCNorthwest Castings | Seattle | WA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| NSNorthwestern Steel and Wire | Sterling | IL | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| NANovelis Aluminum CORP. | Louisville | KY | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| NCNucor Cold Finishing | Darlington | SC | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| NSNucor Steel Birmingham, INC. | Birmingham | AL | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| NTNucor Tubular Products | Bedford Park | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| NMNull's Machine & Mfg., Inc., Huntington | Huntington | WV | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| NDNyc Dept of Parks-columbia Smelting & Refining Works Site | Brooklyn | NY | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| OIOakley, INC. | Dayton | NV | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| OIOakley Industries INC | Niles | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| OSOakley Steel Products CO | Bellwood | IL | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| OLOberdorfer LLC | Syracuse | NY | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| OUOdermath USA INC | Naperville | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| OSOff Site Storage | Portland | OR | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| OCOhio Cold Rolling Company LLC | Yorkville | OH | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| ODOhio Decorative Products LLC | Spencerville | OH | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| OPOhio Precious Metals LLC | Jackson | OH | Primary Metal Manufacturing331000 | — | ◇ UNVERIFIED |
| OVOhio Valley Aluminum C LLC Niles Facilit | Niles | OH | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
 Oil City Iron Works INC | Corsicana | TX | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| OWOkonite Wire & Cable | Cumberland | RI | Primary Metal Manufacturing331422 | — | ◇ UNVERIFIED |
