Analysis
NAICS 4921 is the 2022 industry group for couriers and express delivery services, part of 492 (Couriers and Messengers).
It has only one more detailed code, 492110, which covers exactly the same activities; the definition, index entries and statistics are on that page.
County Business Patterns counts 10,859 US establishments in this code in 2023, employing 1,036,160 people at an average annual payroll of $53,476 per employee (22nd percentile of national industries). 35% of the establishments have fewer than five employees, which is close to the national mix.
By establishments it ranks 1st of the 2 codes at this level within Couriers and Messengers, with 66.9% of them.
Between 2018 and 2023 the number of establishments grew 9% and employment rose 67%. 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.