CA Prob Code Section 3921

Subject to the power of the court to transfer actions and proceedings as provided in the Code of Civil Procedure, a petition filed under this part shall be heard and proceedings thereon held in the superior court in the proper county, which shall be determined as follows:

(a)

If the minor resides in this state, in either of the following counties:

(1)

Where the minor resides.

(2)

Where the custodian resides.

(b)

If the minor does not reside within this state, in any of the following counties:

(1)

Where the transferor resides.

(2)

Where the custodian resides.

(3)

Where the estate of a deceased or legally incapacitated custodian is being administered.

(4)

Where a parent of the minor resides.

(c)

If neither the minor, nor the transferor, nor any parent resides within this state, and no estate of a deceased or legally incapacitated custodian is being administered within this state, in any county.