Thomas F. Eagleton United States Courthouse
No actual frequencies confirmed.   (Maintenance provided by General Services Administration (GSA)

Federal Reserve Bank of St Louis
Gateway Arch National Historic Site/Gateway Arch National Park
United States Postal Service 
US Department of Justice - 25 Cities Interoperability Project
 Customs and Border Protection / TSA
 DEA - Drug Enforcement Agency (St Louis)
 FBI - Federal Bureau of Investigations
 Federal Protective Services - Region 6
 National Geospatial-Intelligence Agency
 United States Secret Service

See St Louis City for these agencies