Region I: Allegany County, Garrett County.
Region II: Washington County, Frederick County.
Region III: Anne Arundel County, Baltimore County, Baltimore City, Carroll County, Harford County, Howard County, Cecil County.
Region IV: Kent, Queen Annes, Caroline, Talbot, Dorchester, Wicomico, Someset, Worcester County.
Region V: Calvert County, Charles County, Montgomery County, Prince George's County, St. Mary's County.
Tone A = 127.3 Hz
Tone B = 146.2 Hz
Tone C = 167.9 Hz (Region III)
Tone D = 192.8 Hz (Region V and Washington DC)