Analysis
NAICS 33631 is the 2022 NAICS industry for motor vehicle gasoline engine and engine parts manufacturing, part of 3363 (Motor Vehicle Parts Manufacturing).
It has only one more detailed code, 336310, 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 11% and employment fell 3%. 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 696 US establishments in this code in 2023, employing 61,615 people at an average annual payroll of $69,898 per employee (52nd percentile of national industries). 43% of the establishments have fewer than five employees, which is close to the national mix.
By establishments it ranks 3rd of the 8 codes at this level within Motor Vehicle Parts Manufacturing, with 14.9% of them.
Official definition
See industry description for 336310.
Source: US Census Bureau, NAICS 2022 Manual.