Uniformed Federal Agencies in the United States
These agencies (or divisions) operate as a local police department for the agency's property.

Picture By: U.S. Secret Service
These agencies employ uniformed federal police officers with police authority under OPM Series 0083 or similar classifications (0025-1801-1895-1896).
*This is not a comprehensive list as each federal installation may have its own name for its police force, such as Redstone Arsenal Police Department for the Redstone Arsenal, Alabama Army Military Base, or CNIC, CNRSW, and ONI Police for the Navy.*