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Primary Metal Manufacturing

8,651 FACILITIESAll Census product lines →

NAICS 331

Map, cities and product lines
Map of United States manufacturing facilities

Product lines reported here

These are counts by industry: the Economic Census records what establishments in primary metal manufacturing reported producing, and never names a plant.

Plants in this industry8,651 FACILITIES

FacilityCityStateEmployeesStatus
Materion Brush INCElmoreOH500+ ACTIVE
Matthews International CorporationSearcyAR100–499 ACTIVE
Matthews International CorporationPittsburghPA— ACTIVE
Maynard Steel Casting COMilwaukeeWI100–499 ACTIVE
Mcwane Ductile - New JerseyPhillipsburgNJ100–499 ACTIVE
M-d Building Products, INC.Oklahoma CityOK500+ ACTIVE
M E Global INCTempeAZ100–499 ACTIVE
Meloon Foundries, LLCSyracuseNY20–99 ACTIVE
Merit Steel CompanyKoutsIN20–99 ACTIVE
Metallic Resources INCTwinsburgOH20–99 ACTIVE
Metal Technologies Auburn LLCAuburnIN100–499 ACTIVE
Metalx Aluminum Conversions LLCWabashIN100–499 ACTIVE
Metglas, INCConwaySC100–499 ACTIVE
Michigan Seamless Tube, LLCSouth LyonMI100–499 ACTIVE
Micro-tek CorporationCinnaminsonNJ20–99 ACTIVE
Miller Castings INCWhittierCA100–499 ACTIVE
Minalex CORPWhitehouse StationNJ20–99 ACTIVE
Minnesota Wire & Cable COSaint PaulMN— ACTIVE
Morgan Advanced Ceramics, INC.HaywardCA100–499 ACTIVE
Mueller Brass CO.Port HuronMI100–499 ACTIVE
Mueller COAlbertvilleAL500+ ACTIVE
Mueller Impacts Co, INCMarysvilleMI20–99 ACTIVE
Mws Precision Wire Industries, INC.OxnardCA20–99 ACTIVE
Nathan Trotter and Co., INCCoatesvillePA20–99 ACTIVE
New England Wire Technologies CORP.LisbonNH100–499 ACTIVE
Ngk Metals CorporationSweetwaterTN20–99 ACTIVE
Nielsen Moulding, LLCGainesboroTN20–99 ACTIVE
Nj Shell Casting Corp/ MariettaMariettaPA1–19 ACTIVE
North American StainlessGhentKY500+ ACTIVE
Northlake Steel CORPValley CityOH20–99 ACTIVE
North Star Bluescope Steel LLCDeltaOH500+ ACTIVE
Novamet Specialty Products CorporationLebanonTN20–99 ACTIVE
Nucor SteelCrawfordsvilleIN500+ ACTIVE
Nucor Steel- BerkeleyHugerSC500+ ACTIVE
Nucor Steel DecaturTrinityAL500+ ACTIVE
Nucor Steel Memphis, INCMemphisTN500+ ACTIVE
Ohio Star Forge CO.ChampionOH100–499 ACTIVE
Oil City Iron Works, INCCorsicanaTX100–499 ACTIVE
Olympic Industries, LLCCordovaTN20–99 ACTIVE
Omaha Steel CastingsWahooNE20–99 ACTIVE
Omega Castings, INCBattle CreekMI— ACTIVE
Optical Cable CORPRoanokeVA100–499 ACTIVE
Oregon Steel Mills LLCPortlandOR— ACTIVE
Osco Industries INC - Jackson DivJacksonOH100–499 ACTIVE
Padgett INCNew AlbanyIN100–499 ACTIVE
Parmatech CorporationPetalumaCA20–99 ACTIVE
Pcc Airfoils LLC Smp INCWickliffeOH100–499 ACTIVE
Pcc Airfoils MentorMentorOH100–499 ACTIVE
Pcc Structurals, INC.PortlandOR— ACTIVE
Pcc Structurals - San LeandroSan LeandroCA100–499 ACTIVE

Search all 8,651 facilities

Common questions

How many primary metal manufacturing facilities are in the United States?

As of AUG 2026, FactoryRegistry lists 8,651 primary metal manufacturing facilities (NAICS 331) across 53 states, compiled from EPA, OSHA and Census records.

Which state has the most primary metal manufacturing facilities?

California, with 877 facilities listed.

How many primary metal manufacturing facilities are still operating?

3,820 of the 8,651 listed carry a recent operating signal in federal data — the register's Active or Likely active status. The rest are listed from their filings alone, which is a gap in the federal record rather than evidence that a plant has closed.