FAMILY CODE SECTION 7845
7845. The petition shall be filed in any of the following:
(a) The county in which a minor described in Chapter 2 (commencing
with Section 7820) resides or is found.
(b) The county in which any of the acts which are set forth in
Chapter 2 (commencing with Section 7820) are alleged to have
(c) The county in which a petition for the adoption of the child
has been filed or the adoption agency to which the child has been
relinquished or proposed to be relinquished has an office.