Ohio Rev. Code Ann. § 1309.501 – Filing office - UCC 9-501

(A) Except as provided in division (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. (1) The office designated for the filing or recording of a record of a mortgage on the related real property, if:
  1. (a) The collateral is as-extracted collateral or timber to be cut; or
  2. (b) The financing statement is filed as a fixture filing, and the collateral is goods that are or are to become fixtures.
2. (2) The office of the secretary of state or any office duly authorized by the secretary of state, 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. The financing statement also constitutes a fixture filing as to the collateral indicated in the financing statement that is or is to become fixtures.