San Fernando Courthouse for family law.
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Any court in Ca has jurisdiction to issue Domestic Violence Restraining Orders. I suggest you file in the county in which you reside if there are other issues such as child custody, though, to avoid having conflicting orders from different courts, because custody jurisdiction will have to be dealt with in a county that has jurisdiction over you & the other party. But DV TRO's can be sought anywhere in the State.
This is a general answer and does not constitute legal advice. By answering this question, I am not creating an attorney/client relationship, and no such relationship will be created unless a representation agreement is signed by both you and me.