NAICS 3221 is the North American Industry Classification System code for Pulp, Paper, and Paperboard Mills, a industry group in the Paper Manufacturing subsector (322) of the Manufacturing sector (31-33). It divides into 3 more specific codes, including Pulp Mills (322110), Paper Mills (322120) and Paperboard Mills (322130).
NAICS 3221 is the code for Pulp, Paper, and Paperboard Mills, a industry group in the North American Industry Classification System (NAICS 2022), under 322 (Paper Manufacturing). It has 3 more specific codes: 322110, 322120 and 322130.
The parent of NAICS 3221 is 322, Paper Manufacturing. Every company under 3221 is also counted under 322.