The main rule for this thread is that there must be at least 15 of the models remaining. Extinct sirens are allowed to be mentioned. Anyways, on with the main attraction.
ACA/ASC/B&N
Hurricane (Square horned, Tri-Signal, different ports)
Sentry 95
Screamer 105 (Two known to exist. One is in a scrapyard, while the other was on a fire department in California)
Mobil Directo (Gas powered)
Alertronic 5000
Alertronic 7200
Banshee 110 (10/12 port)
Quadren (3 known locations)
Federal Signal/Darley
Thunderbolt (2000, System 7000, rounded rotator and blower, 6M/6MC)
EOWS 408 (Two remaining)
EOWS 812
EOWS MS-12
550 DHTT (One known to be active)
W.S. Darley Model 5TT / 7TT (7TT owned by IceBolt_1003)
Model 1
Model 5QC
Whelen
WS-2000/400R
WPS-4000-II
WPS-2500
Sentry/Sterling
Defender
40V1T
20V2T (Square horned)
Y-10 (Functional breaks)
Duplex/Quadruplex
HOR
Super Sirex (Single-headed, 10 port, 7/10 port)
CTI
SMO15
SMO15-H
SMR15
CLM
Omnidirectional
Unidirectional
UK Sirens
Gents (Tri-Tone)
CS-8 and CS-3
Miscellaneous
Decot (6/10 ports)
Model 120 (One known to exist and is owned by a siren enthusiast)
Custer Electric sirens (Still in production)
10 port French siren
Clayton Whirlwind
Cosgrave siren
Cicca
Cicca type 6218
Remember to help me expand the list! Thanks!
