Each officer of the corporation, or any department or board thereof, whether elected or appointed as a substitute for a regular officer, shall be an elector within the corporation, except as otherwise expressly provided, and before entering upon his official duties shall take an oath to support the constitutions of the United States and of Ohio, and an oath that he will faithfully, honestly, and impartially discharge the duties of his office. Provisions concerning official oaths shall apply to deputies, but they need not be electors.
(R.C. § 733.68)