I have noticed that too. I can give you 6355 seems to be Mid Co 114 Ambulance, 6493 seems to be all Co. EMS units, 6495 seems to be all Co. Fire units, 6498 Appears to be Mellen Fire. Other talk groups to watch are: 6324, 6474(May be Cedarville Fire), 6483, 6491(may be Cedarville Fire), 6497...