Analysis
NAICS 3321 is the 2022 industry group for forging and stamping, part of 332 (Fabricated Metal Product Manufacturing).
It has only one more detailed code, 33211, 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 16% and employment fell 12%. 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 1,937 US establishments in this code in 2023, employing 92,778 people at an average annual payroll of $67,898 per employee (50th percentile of national industries). 19% of the establishments have fewer than five employees, which points to larger operations.
By establishments it ranks 5th of the 9 codes at this level within Fabricated Metal Product Manufacturing, with 3.6% of them.