Okla. Stat. tit. 58, § 58-7: Jurisdiction coextensive with state

The district court of the county in which application is first

made for letters testamentary or of administration in any of the

cases above mentioned, shall have jurisdiction coextensive with the

State in the settlement of the estate of the decedent and the sale

and distribution of his real estate and excludes the jurisdiction of

the district court of every other county.