Ohio Revised Code Title XIX. Courts Municipal Mayor's County § 1907.03

(A) Under the restrictions and limitations of this chapter, county courts have exclusive original jurisdiction in civil actions for the recovery of sums not exceeding five hundred dollars and original jurisdiction in civil actions for the recovery of sums not exceeding fifteen thousand dollars.

(B) If a counterclaim is filed in a civil action in a county court and the counterclaim exceeds fifteen thousand dollars, the county court shall certify the action to the court of common pleas.

(C) If a civil action is certified to the court of common pleas pursuant to division (B) of this section, the clerk of the county court forthwith shall transmit to the court of common pleas the original papers and pleadings in the action and a certified transcript of the journal entries in it. The action then shall proceed in the court of common pleas as if it had been originally commenced in that court.