The county fire department radios went live with what I am guessing is a new A zone sometime in early December. I have no clue on the procedure for how talkgroups are assigned for calls, but they seem to have replaced the previous C zone assignments for most calls.
I assume A1-A3 are Red, Silver, and Yellow. Command A4, Command A8, and Command A12 have been confirmed as 4795, 4797, and 4799. If they follow the CSFD model, then A5, A9, and A13 could be Tacs on 4796, 4798, and 4800. The El Paso County twist is that Simplex A6 is a simplex frequency, which could mean that A10 and A14 are also simplex frequencies. Zero clue on the rest of A zone.
The simplex frequencies might be licensed under
FCC Callsign WREA599 (EL PASO COUNTY SHERIFF (CO)), but I have zero chance of ever hearing these so good luck to whomever finds them.