Vortexofmisery, welcome! I live in St. Charles County. Nice to have another St. Louis area siren enthusiast on board!
That St. Charles County siren list that you mentioned has not been updated in several years, unfortunately. Yes, we do have lots of Whelens out here; in fact I live about 1/4 of a mile from an O'Fallon siren, a Whelen WPS-2806, which can be seen from my kitchen window. Very loud from here!
Hey, why didn't you snap a pic of East Alton's 2T22? I just saw that last night while passing through going to a FOOLS meeting in Wood River (at the Franchise Bar). In fact I saw one of the 4003's, there on Edwardsville Rd., going to the meeting. I remember seeing Wood River's T-Bolt years ago when one was located near the fire station.
Again, welcome!