Analysis
NAICS 11221 is the 2022 NAICS industry for hog and pig farming, part of 1122 (Hog and Pig Farming).
It has only one more detailed code, 112210, which covers exactly the same activities; the definition, index entries and statistics are on that page.
County Business Patterns does not cover crop and animal production, so there is no establishment count for it; farms are counted by the Census of Agriculture instead.
Official definition
See industry description for 112210.
Source: US Census Bureau, NAICS 2022 Manual.