Analysis
NAICS 925 is the 2022 subsector for administration of housing programs, urban planning, and community development, part of 92 (Public Administration).
It has only one more detailed code, 9251, 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
The Administration of Housing Programs, Urban Planning, and Community Development subsector groups government establishments primarily engaged in the administration of housing, urban planning, and community development.
Source: US Census Bureau, NAICS 2022 Manual.