Yes, cousin marriage is legal in Ohio, but subject to specific restrictions under state law and local county probate court oversight.
Ohio Revised Code § 2901.08 permits first-cousin marriages if both parties are at least 65 years old or if one is sterile. The Franklin County Probate Court, for instance, enforces these provisions through mandatory medical certification filings. Recent 2026 compliance shifts require applicants to submit genetic counseling documentation when genetic risks are suspected, aligning with Ohio Department of Health guidelines. Failure to comply risks nullification of the marriage license.
Key Regulations for Cousin Marriage in Ohio
- Age and Sterility Exceptions: Valid only if both parties are 65+ or one is medically sterile (ORC § 2901.08).
- Medical Certification: Applicants must provide notarized proof of sterility or age eligibility to the county probate court.
- Genetic Counseling Mandate (2026): If genetic risks are identified, courts require counseling from an Ohio-licensed genetic counselor before license issuance.
Local probate courts retain discretion to deny licenses if documentation is incomplete or risks are substantiated. Violations may result in civil penalties under ORC § 3101.05. Consult the Ohio Supreme Court’s 2025 Probate Practice Manual for procedural updates.