Analysis
NAICS 3313 is the 2022 industry group for alumina and aluminum production and processing, part of 331 (Primary Metal Manufacturing).
It has only one more detailed code, 33131, which covers exactly the same activities; the definition, index entries and statistics are on that page.
Between 2018 and 2023 the number of establishments fell 14% and employment fell 4%. The 2018 count used NAICS 2017, so part of a large move can come from codes being redefined rather than from businesses opening or closing.
County Business Patterns counts 431 US establishments in this code in 2023, employing 57,358 people at an average annual payroll of $76,177 per employee (63rd percentile of national industries). 14% of the establishments have fewer than five employees, which points to larger operations.
By establishments it ranks 4th of the 5 codes at this level within Primary Metal Manufacturing, with 12.1% of them.