| LAL a Burnhart INC | Brighton | MI | — | ◇ UNVERIFIED |
| LSLake Shore Foundry CO INC | Waukegan | IL | — | ◇ UNVERIFIED |
| LSLakeside Steel Alabama - Thomasville Finishing Works | Thomasville | AL | — | ◇ UNVERIFIED |
| LELands End Sculpture Center, INC. | Paonia | CO | — | ◇ UNVERIFIED |
| LMLane Metal Prod | Pulaski | PA | — | ◇ UNVERIFIED |
| LPLange's Production Specialties INC | Medford | OR | — | ◇ UNVERIFIED |
| LFLasco Fittings, INC. | Orlando | FL | — | ◇ UNVERIFIED |
| LLLaurentec LLC | Summerville | SC | — | ◇ UNVERIFIED |
| LFLb Foster | Magnolia | TX | — | ◇ UNVERIFIED |
| LELeading Edge Group, INC. | Rockford | IL | — | ◇ UNVERIFIED |
| LTLenape Tooling INC | Perkasie | PA | — | ◇ UNVERIFIED |
| LPLeonhardt Pipe - Supply INC | Blackstock | SC | — | ◇ UNVERIFIED |
| LPLeroy Plastics INC. | Leroy | NY | — | ◇ UNVERIFIED |
| LRLicking River Castings | Falmouth | KY | — | ◇ UNVERIFIED |
| LILigon Industries, LLC | Birmingham | AL | — | ◇ UNVERIFIED |
| LILincoln Industries of Minnesota INC | Pine Island | MN | — | ◇ UNVERIFIED |
| LMLincoln Manufacturing North Plant | Magnolia | TX | — | ◇ UNVERIFIED |
| LGLinde Gas & Equipment INC | Fresno | CA | — | ◇ UNVERIFIED |
| LILisega INC. | Newport | TN | — | ◇ UNVERIFIED |
| LALoftis Alumi-tec INC | Grand Haven | MI | — | ◇ UNVERIFIED |
 L & R Manufacturing Co., INC. | Worcester | MA | — | ◇ UNVERIFIED |
| LTL to Z Ent INC | Banning | CA | — | ◇ UNVERIFIED |
| LMLunt Manufacturing CO INC | Schaumburg | IL | — | ◇ UNVERIFIED |
 M2 Performance Solutions LLC | Concord | NC | — | ◇ UNVERIFIED |
| MPMaclean Power, L.l.c. | Alabaster | AL | — | ◇ UNVERIFIED |
| MPMaclean Power Systems, Limited Partnership | Pelham | AL | — | ◇ UNVERIFIED |
| MIMaclyn Incorporated | New Berlin | PA | — | ◇ UNVERIFIED |
| MAMagnesium Alloy Prod. CO | Compton | CA | — | ◇ UNVERIFIED |
| MIMagparts INC | Azusa | CA | — | ◇ UNVERIFIED |
| MBMaiden Bronze | Sandy | OR | — | ◇ UNVERIFIED |
| MBMajor Brass Foundry INC | Gardena | CA | — | ◇ UNVERIFIED |
| MMMarble Machine, INC. | Danville | IL | — | ◇ UNVERIFIED |
| MEMarkovitz Ents INC Flowline Div | Whiteville | NC | — | ◇ UNVERIFIED |
| MIMarson International LLC | Elkhart | IN | — | ◇ UNVERIFIED |
| MIMarson International LLC | Elkhart | IN | — | ◇ UNVERIFIED |
| MMMartin Marietta Corporation | No Locality Name to Migrate From 2002 Nei V3 | NY | — | ◇ UNVERIFIED |
| MIMathews International Corporation | Winter Haven | FL | — | ◇ UNVERIFIED |
 Matthews International Corporation | San Jacinto | CA | — | ◇ UNVERIFIED |
| Matthews International Corporation | Kingwood | WV | — | ◇ UNVERIFIED |
| MCMcjunkin CORP | Princeton | WV | — | ◇ UNVERIFIED |
| MPMcwane Poles | Coshocton | OH | — | ◇ UNVERIFIED |
| MWM-d Welding LLC | Minneapolis | MN | — | ◇ UNVERIFIED |
| MBMetal Briquetting Company | Los Angeles | CA | — | ◇ UNVERIFIED |
| MCMetal Casting Technology, INC. | Milford | NH | — | ◇ UNVERIFIED |
| MAMetallic Arts | Spokane | WA | — | ◇ UNVERIFIED |
| MCMetalloy CORP Foundry Div | Hudson | MI | — | ◇ UNVERIFIED |
| MCMetalloy Corp, The, Mississippi Division | Shannon | MS | — | ◇ UNVERIFIED |
| MTMetal Technologies INC | Bloomfield | IN | — | ◇ UNVERIFIED |
| MBMetro Boiler Tube Company, INC. | Gonzales | LA | — | ◇ UNVERIFIED |
| MMMichigan Magna INC | Romulus | MI | — | ◇ UNVERIFIED |
| MMMichigan Metal Technologies INC | Chesterfield | MI | — | ◇ UNVERIFIED |
| MWMichigan Wire Die | Warren | MI | — | ◇ UNVERIFIED |
| MMMidland Mechanical, INC. | Billings | MT | — | ◇ UNVERIFIED |
| MHMile Hi Metal Foundry | Denver | CO | — | ◇ UNVERIFIED |
| MPMitchell Piping, LLC | Hartville | OH | — | ◇ UNVERIFIED |
 M&m Industries, INC. | Chester | PA | — | ◇ UNVERIFIED |
| MCModern Custom Casting | Rockford | IL | — | ◇ UNVERIFIED |
| MMModern Metals Foundry INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| MSMontana Sulphur and Chemical Company | Billings | MT | — | ◇ UNVERIFIED |
| MBMontclair Bronze INC | Montclair | CA | — | ◇ UNVERIFIED |
| MRMontgomery Roessing Company | Pittsburgh | PA | — | ◇ UNVERIFIED |
| MBMorris Bean & CO * | Yellow Springs | OH | — | ◇ UNVERIFIED |
| MCMorris Coupling Company, INC. | Knoxville | TN | — | ◇ UNVERIFIED |
| MFMountaineer Fabricators INC | Nitro | WV | — | ◇ UNVERIFIED |
| MEMps Enterprises | Hobbs | NM | — | ◇ UNVERIFIED |
| MAMt Angel Art Foundry INC | Mount Angel | OR | — | ◇ UNVERIFIED |
| NLNanoal LLC | Ashland | MA | — | ◇ UNVERIFIED |
| NPNapa Pipe CORP | Napa | CA | — | ◇ UNVERIFIED |
| NBNational Bronze & Metals (ohio) INC | Lorain | OH | — | ◇ UNVERIFIED |
| NCNational Chimney Kentucky LLC Dba Magnaflex | Mount Sterling | KY | — | ◇ UNVERIFIED |
| NSNavasota Site | Navasota | TX | — | ◇ UNVERIFIED |
| NGNelson Global - Fortune Circle | Indianapolis | IN | — | ◇ UNVERIFIED |
| NCNew Century Industries | Industry | CA | — | ◇ UNVERIFIED |
| NMNew Mansfield Brass and Aluminum | New Washington | OH | — | ◇ UNVERIFIED |
| NGNorma Group | Auburn Hills | MI | — | ◇ UNVERIFIED |
| NANorman Arts INC | Enterprise | OR | — | ◇ UNVERIFIED |
| NANorthern Aluminum Foundry | North Fond Du Lac | WI | — | ◇ UNVERIFIED |
| NHNorthern Horizons INC | Solway | MN | — | ◇ UNVERIFIED |
| NANorthwest Aluminum & Brass Foundries, INC. | Muskego | WI | — | ◇ UNVERIFIED |
| NBNorthwest Brass & Aluminum Foundry INC | Portland | OR | — | ◇ UNVERIFIED |
| NCNorthwest Casting INC | Saint Paul | MN | — | ◇ UNVERIFIED |
| NGNov Grant Prideco | Navasota | TX | — | ◇ UNVERIFIED |
| OLOberdorfer LLC | Syracuse | NY | — | ◇ UNVERIFIED |
 Oceaneering International INC | Panama City | FL | — | ◇ UNVERIFIED |
| OAO-flex Automotive INC | Murfreesboro | TN | — | ◇ UNVERIFIED |
| OCO'keefe Casting | Lorain | OH | — | ◇ UNVERIFIED |
| OPOk Pipe & Fittings,inc. | Kingwood | TX | — | ◇ UNVERIFIED |
| OAOlson Aluminum Castings | Rockford | IL | — | ◇ UNVERIFIED |
| OTOmk Tube Miller Rd 2 | Houston | TX | — | ◇ UNVERIFIED |
| OCOntario Castings, Performance Aluminum Products, Reeds Patterns & Molds, R&S ... | Ontario | CA | — | ◇ UNVERIFIED |
| OEOrion Enterprises INC | Kansas City | KS | — | ◇ UNVERIFIED |
| POPact One Llc/ W Norriton Twp | Trooper | PA | — | ◇ UNVERIFIED |
| PFPalmer Foundry | Palmer | MA | — | ◇ UNVERIFIED |
| PCParsons CO INC | Goodfield | IL | — | ◇ UNVERIFIED |
| PSPatriot Stainless, INC. | Zanesville | OH | — | ◇ UNVERIFIED |
| PPPaulsen Pipe, LLC | South Holland | IL | — | ◇ UNVERIFIED |
 Pcc Structurals INC Lsbs Iii | Portland | OR | — | ◇ UNVERIFIED |
| Pcc Structurals, Inc.-machine Shop | Portland | OR | — | ◇ UNVERIFIED |
| Pcc Structurals, INC. - West Haven | Ogden | UT | — | ◇ UNVERIFIED |
| PCPechiney Cast Plate INC | Vernon | CA | — | ◇ UNVERIFIED |
