Analysis
NAICS 32511 is the 2022 NAICS industry for petrochemical manufacturing, part of 3251 (Basic Chemical Manufacturing).
It has only one more detailed code, 325110, 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 58% and employment rose 15%. 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 76 US establishments in this code in 2023, employing 10,888 people at an average annual payroll of $154,222 per employee (98th percentile of national industries). 18% of the establishments have fewer than five employees, which points to larger operations.
By establishments it ranks 5th of the 5 codes at this level within Basic Chemical Manufacturing, with 2.9% of them.
Official definition
See industry description for 325110.
Source: US Census Bureau, NAICS 2022 Manual.