As listed in NewsAlan's USD files - for EMS: Channels 9(Urban) & 10 (Suburban) are the active dispatch channels. Channel 6(suburban) and 5(urban) are the service or BS channels. Channel 8 (and possibly 7) is med unit to hospital call-ins, (mostly). All his frequencies and pl tones are accurate, as are NOFDExplorer's (though he's missing a pl tone or two).
Med channels 1,2,3, are rarely, if ever used. 4 is a back-up service channel.
On fire, channels 1-4 (Urban) are used. 4 is dispatch. 1 is most operations, 2 is for used on big fires. 3 are investigators and inspectors. Channels 1-3 (Suburban), mutual aid and dispatch are in heavy use. Channel 4 is an overflow channel.
On suburban police, channels 1 and 2 are dispatch channels. 3 is for warrants and other mundance stuff. 4 is a simplex BS channel. Command is a patch to urban channels.
I don't listen much to urban police, so I don't know much about them.
Urban is within the old city limits. Suburban is outside that (general outside of the watterson expressway).