Or are you asking which counties have their own "expanded scope" courses you have to take on top of the state card and which counties only care about the state card?
LA Co has a 4 hour course you have to take to work here. Orange County has its own (they used to even issue a plastic card similar to the state card, but not anymore).
But to the best of my knowledge, I EMS and REMS do not require a special course above and beyond, i.e. they're happy with just my state card obtained through LA Co EMS Agency.