Okla. Stat. tit. 60, § 60-1602.3: Venue

A. Except as otherwise provided in subsection B of this

section, venue for a judicial proceeding involving a trust is proper

in the county of this state in which the trust's principal place of

administration is or will be located and, if the trust is created by

will and the estate is not yet closed, in the county in which the

decedent's estate is being administered.

B. If a trust has no trustee, venue for a judicial proceeding

for the appointment of a trustee may be in a county of this state in

which a beneficiary resides, in a county in which any trust property

is located, and if the trust is created by will, in the county in

which the decedent's estate was or is being administered.

ARTICLE 3

REPRESENTATION