I liked KSR's Three Californias trilogy, though it's been a while since I read them and I couldn't be sure which are set in LA rather than just the outskirts thereof.

Definitely counts, and they're great. (Almost used the cover of The Wild Shore as one of the pictures for this tweet.)

All three of them are set in Orange County (I've heard it called "the Orange County trilogy" which is certainly LA-area.