Analysis
NAICS 54199 is the 2022 NAICS industry for all other professional, scientific, and technical services, part of 5419 (Other Professional, Scientific, and Technical Services).
It has only one more detailed code, 541990, 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 23% and employment rose 30%. 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 24,892 US establishments in this code in 2023, employing 139,378 people at an average annual payroll of $89,184 per employee (77th percentile of national industries). 83% of the establishments have fewer than five employees, which marks it as a small-business industry.
By establishments it ranks 2nd of the 5 codes at this level within Other Professional, Scientific, and Technical Services, with 30% of them.
Official definition
See industry description for 541990.
Source: US Census Bureau, NAICS 2022 Manual.