Analysis
NAICS 3366 is the 2022 industry group for ship and boat building, part of 336 (Transportation Equipment Manufacturing).
It has only one more detailed code, 33661, which covers exactly the same activities; the definition, index entries and statistics are on that page.
County Business Patterns counts 1,427 US establishments in this code in 2023, employing 150,621 people at an average annual payroll of $68,504 per employee (50th percentile of national industries). 32% of the establishments have fewer than five employees, which is close to the national mix.
Between 2018 and 2023 the number of establishments fell 3% and employment rose 10%. 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.
By establishments it ranks 4th of the 7 codes at this level within Transportation Equipment Manufacturing, with 12.2% of them.