Parts outside Sac and further up..
Modesto and parts of Fresno..
Pretty much anything after you leave The Bay driving down PCH to SoCal..

dawg, a couple years ago, i drove down with my homie from a little north of sac to berkeley... got lost taking them backroads there through yolo county... you'd think you were in the deep south. if you watch that matt barnes vice interview, he gives a good depiction of how racist sac can be.
then yes... going south of san jose til you hit los angeles is a shyt hole... may as well be dropped in the rural mid-west
adding to this list, i'd say some places east of LA county going toward vegas have basically zero blacks and

(apple valley, hemet). once you leave the cities it becomes apparent that there are two californias...