Primary Metal Manufacturing
8,651 FACILITIESAll Census product lines →NAICS 331
Map, cities and product lines
Top cities
Product lines reported here
Other metal processing and metalworking contract manufacturing…Manufacturing of aluminum ingotManufacturing of steel investment castingsHeat treating of metal for the tradeMachined metal, plastic, or other composite parts on a job…Manufacturing of alloy steel
These are counts by industry: the Economic Census records what establishments in primary metal manufacturing reported producing, and never names a plant.
Where these plants are53 STATES
Bars are drawn against California, the largest, rather than against the national total.
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.