2022 NAICS industry in sector 31-33 Manufacturing
33131 Alumina and Aluminum Production and Processing
NAICS 33131 is the US industry code for alumina and aluminum production and processing. It covers establishments primarily engaged in one or more of the following: (1) refining alumina; (2) making (i.e., the primary production) aluminum from alumina; (3) recovering aluminum from scrap or dross; (4) alloying purchased aluminum; and (5) manufacturing aluminum primary forms (e.g., bar, foil, pipe, plate, rod, sheet, tube, wire).
Official definition
This industry comprises establishments primarily engaged in one or more of the following: (1) refining alumina; (2) making (i.e., the primary production) aluminum from alumina; (3) recovering aluminum from scrap or dross; (4) alloying purchased aluminum; and (5) manufacturing aluminum primary forms (e.g., bar, foil, pipe, plate, rod, sheet, tube, wire).
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Manufacturing aluminum oxide abrasives and refractories are classified in Subsector 327, Nonmetallic Mineral Product Manufacturing.
- Sorting, breaking up, and wholesaling scrap aluminum metal without also smelting or refining are classified in Industry 42393, Recyclable Material Merchant Wholesalers.
- Operating facilities where commingled recyclable materials, such as paper, plastics, used beverage cans, and metals, are sorted into distinct categories without also smelting or refining are classified in Industry 56292, Materials Recovery Facilities.
Codes in 33131
Data last changed November 14, 2026. How this page is built.