They're mostly in the mountains, but hey, this could still happen. From the Nine Commandments.
You SoCal outdoorspeople might be chuckling to yourself that I'm surprised by this, but what can I say. When I first looked at this map I thought the CA Department of Fish and Game's map, which I thought was being overenthusiastic - for example, they have all of Marin County as bear territory, and to my knowledge there was has been one unconfirmed bear sighting in Point Reyes in recent history.
But here are sightings, tree-ings and cooler break-ins (including Julian and Ramona) through 2000.
From CA DFG.