They don't use very many. Most agencies went to plain English long ago using only a couple 10 codes. 10-33 is emergency traffic, 10-8, (in service/on duty). 10-7, (out of service, off duty), 10-6(busy), and a few others. I think 10-63 or 64 is an announcement or BOLO for all channels. Most others if they use them you can figure out by the nature of the radio traffic.
I have been listening pretty much continuously for about the last two weeks and GCSO uses a fair amount of 10 codes. While I understand that most agencies moved to plain speak years ago due to ICS and such, it seems that GCSO did not follow that standard.
I haven't monitored them as much as I use too. I was in the Schertz area all day so I threw the West channel in the scan list. Everything I heard sounds like old standard 10-codes. The ones I mentioned above. Plus 10-96-mental health subject. 10-99 wanted person etc.... Here is a link to the standard codes.
