Most urban offices will also designate cars for unincorporated patrols, and assign beat numbers to those areas.
For example near me is Santa Fe Springs office (83) South Whittier beat (Beat 2) and the car is 8321. If you hear the phonetic Adam, Boy, or Charles,there may be two cars of the same beat, different shift out at same time. that is shift (Adam-Days, Boy-swing, Charles- nights, If my memory is still intact).
If you listen a while you may hear references to a beat, or if your geography gifted it will be easy to figure it out after a short time listening.
If you have a particular interest in a given station in Golden Gate area post it here,, somebody will be able to provide some specifics, but I have never come across an all inclusive list of call signs statewide.