Okla. Stat. tit. 12A, § 12A-1-9-501: Filing office

FILING OFFICE

(a) Except as otherwise provided in subsection (b) of this

section, if the local law of this state governs perfection of a

security interest or agricultural lien, the office in which to file

a financing statement to perfect the security interest or

agricultural lien is:

(1) the office designated for the filing or recording of a

record of a mortgage on the related real property, if:

(A) the collateral is as-extracted collateral or timber to

be cut; or

(B) the financing statement is filed as a fixture filing

and the collateral is goods that are or are to become

fixtures; or

(2) the office of the county clerk of Oklahoma County, in all

other cases, including a case in which the collateral is goods that

are or are to become fixtures and the financing statement is not

filed as a fixture filing.

(b) The office in which to file a financing statement to

perfect a security interest in collateral, including fixtures, of a

transmitting utility is the office of the Secretary of State

pursuant to Sections 17 and 18 of Title 46 of the Oklahoma Statutes.

The financing statement also constitutes a fixture filing as to the

collateral indicated in the financing statement which is or is to

become fixtures.