Analysis
NAICS 56172 is the 2022 NAICS industry for janitorial services, part of 5617 (Services to Buildings and Dwellings).
It has only one more detailed code, 561720, which covers exactly the same activities; the definition, index entries and statistics are on that page.
County Business Patterns counts 67,799 US establishments in this code in 2023, employing 1,088,193 people at an average annual payroll of $30,089 per employee (4th percentile of national industries). 61% of the establishments have fewer than five employees, which marks it as a small-business industry.
Between 2018 and 2023 the number of establishments grew 10% and employment rose 1%. 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 5 codes at this level within Services to Buildings and Dwellings, with 29.9% of them.
Official definition
See industry description for 561720.
Source: US Census Bureau, NAICS 2022 Manual.