Analysis
NAICS 927 is the 2022 subsector for space research and technology, part of 92 (Public Administration).
It has only one more detailed code, 927110, 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 Space Research and Technology subsector comprises government establishments primarily engaged in the administration and operations of space flights, space research, and space exploration.
Source: US Census Bureau, NAICS 2022 Manual.