Ohio Revised Code Title XXXV. Elections § 3501.08

Before entering upon the duties of his office, each member of the board of elections shall appear before a person authorized to administer oaths and take and subscribe to an oath that he will support the constitutions of the United States and of the state, will perform the duties of the office to the best of his ability, will enforce the election laws, and will protect and preserve the records and property pertaining to elections. Such oath shall be filed with the clerk of the court of common pleas of the county wherein the officer resides within fifteen days from the date of appointment.