Analysis
NAICS 92612 is the 2022 NAICS industry for regulation and administration of transportation programs, part of 9261 (Administration of Economic Programs).
It has only one more detailed code, 926120, 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 926120.
Source: US Census Bureau, NAICS 2022 Manual.