Thanks, I'm trying to gather it myself but its hard to catch the IDs when they only pop up for a second.The OP asked for unit IDs, not group IDs.
At this point, user ID lists are still being built. Anyone who wants the information needs to gather it for themselves.
I only have 1 scanner available to me and its a Pro-107 (iScan)If you are able to monitor with 2 scanners, may I reccomend the UNITRUNKER program...
Hook one scanner up to gather control channel data, and monitor with the other radio to ID people.
Unitrunker logs each radio ID affiliating with specific towers, and it even logs which talkgroups it transmits on or simply connects to.
If you can only do this with one scanner you can still set the scanner and program up and let it log RID's, then correlate them with the department's TGID's they affiliate with.
Attempting to do this by simply looking at your radio's screen in live time is damn near impossible when compared to this method. TRUSTME.
EDIT: What scanner models do you own. This info will help me recommend the best logging setup.