Analysis
NAICS 92115 is the 2022 NAICS industry for american indian and alaska native tribal governments, part of 9211 (Executive, Legislative, and Other General Government Support).
It has only one more detailed code, 921150, which covers exactly the same activities; the definition, index entries and statistics are on that page.
County Business Patterns excludes public administration, so there is no establishment count for it.
Official definition
See industry description for 921150.
Source: US Census Bureau, NAICS 2022 Manual.