Ohio Revised Code Title XXXI. Domestic Relations Children § 3111.06

(A) Except as otherwise provided in division (B) or (C) of section 3111.381 of the Revised Code, an action authorized under sections 3111.01 to 3111.18 of the Revised Code may be brought in the juvenile court or other court with jurisdiction under section 2101.022 or 2301.03 of the Revised Code of the county in which the child, the child's mother, or the alleged father resides or is found or, if the alleged father is deceased, of the county in which proceedings for the probate of the alleged father's estate have been or can be commenced, or of the county in which the child is being provided support by the county department of job and family services of that county. An action pursuant to sections 3111.01 to 3111.18 of the Revised Code to object to an administrative order issued pursuant to former section 3111.21 or 3111.22 or sections 3111.38 to 3111.54 of the Revised Code determining the existence or nonexistence of a parent and child relationship that has not become final and enforceable, may be brought only in the juvenile court or other court with jurisdiction of the county in which the child support enforcement agency that issued the order is located. If an action for divorce, dissolution, or legal separation has been filed in a court of common pleas, that court of common pleas has original jurisdiction to determine if the parent and child relationship exists between one or both of the parties and any child alleged or presumed to be the child of one or both of the parties.

(B) A person who has sexual intercourse in this state submits to the jurisdiction of the courts of this state as to an action brought under sections 3111.01 to 3111.18 of the Revised Code with respect to a child who may have been conceived by that act of intercourse. In addition to any other method provided by the Rules of Civil Procedure, personal jurisdiction may be acquired by personal service of summons outside this state or by certified mail with proof of actual receipt.