Analysis
NAICS 33612 is the 2022 NAICS industry for heavy duty truck manufacturing, part of 3361 (Motor Vehicle Manufacturing).
It has only one more detailed code, 336120, which covers exactly the same activities; the definition, index entries and statistics are on that page.
Between 2018 and 2023 the number of establishments grew 28% and employment rose 41%. 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 2nd of the 2 codes at this level within Motor Vehicle Manufacturing, with 32.9% of them.
County Business Patterns counts 109 US establishments in this code in 2023, employing 40,522 people at an average annual payroll of $70,385 per employee (52nd percentile of national industries). 17% of the establishments have fewer than five employees, which points to larger operations.
Official definition
See industry description for 336120.
Source: US Census Bureau, NAICS 2022 Manual.