Can you marry your cousin in Oklahoma? If it’s your first cousin, not inside the state — Oklahoma law classifies first-cousin marriage as incestuous and void, with no exceptions for age, genetic counseling, or court approval. Second cousins, on the other hand, can marry here without restriction. And there is one meaningful carve-out even for first cousins: Oklahoma recognizes a first-cousin marriage that was legally performed in another state.
The In-State Ban on First Cousins
Oklahoma’s consanguinity statute, Okla. Stat. tit. 43, § 2, lists first cousins among the relationships that cannot form a valid marriage in the state. A marriage between first cousins performed in Oklahoma is void from the start. That means it carries no legal weight at all: no court can validate it, and none of the rights that normally come with marriage — inheritance, spousal insurance coverage, hospital visitation — ever attach.1Justia. Oklahoma Statutes Title 43-2 – Consanguinity
Second cousins are not listed anywhere in the statute. Because the law names every prohibited relationship specifically, and second cousins are absent, a second-cousin marriage is legal in Oklahoma.
Marriages Performed in Another State
The same statute that bans in-state first-cousin marriages also contains a proviso recognizing first-cousin marriages performed elsewhere. If the marriage was legal where it took place and otherwise valid, Oklahoma treats it as binding from the date of the ceremony.1Justia. Oklahoma Statutes Title 43-2 – Consanguinity
This is a written statutory rule, not a loophole. A first-cousin couple who marries in a state that allows it and then lives in Oklahoma has a legally recognized marriage for property ownership, tax filing, insurance benefits, and parental rights. The practical takeaway is simple: if you want to marry your first cousin and have Oklahoma honor it, the ceremony has to happen in another state’s jurisdiction. Several states currently permit first-cousin marriage, some with conditions such as genetic counseling or an age threshold, so confirm the destination state’s current requirements before making plans.
Criminal Penalties
Violating the ban is not a paperwork problem. Under Okla. Stat. tit. 21, § 885, anyone who marries, lives together as spouses, or has sexual relations with a person within the prohibited degrees of kinship can be convicted of incest. It is a felony punishable by up to ten years in a state penitentiary. A conviction that results in more than two years of imprisonment also triggers sex offender registration after release.
The criminal statute reaches past the marriage ceremony itself. Even without a license, cohabitation or a sexual relationship between first cousins can support a prosecution. Oklahoma is one of roughly nine states that criminalize sexual contact between first cousins, not just the marriage.
Is There an Age-65 Exception?
No. A persistent rumor holds that first cousins in Oklahoma can marry once both reach 65. The text of § 43-2 contains no age-based exception, and the confusion likely comes from mixing Oklahoma up with other states that do have such a rule. Inside Oklahoma the ban is absolute, regardless of the couple’s age or fertility.1Justia. Oklahoma Statutes Title 43-2 – Consanguinity
Does Genetic Counseling Change Anything?
Not in Oklahoma. A handful of states allow first-cousin marriage after genetic testing or counseling; Oklahoma’s statute offers no such waiver. Counseling is still worth considering on its own merits for any closely related couple. First cousins share roughly 12.5 percent of their DNA, which modestly increases the chance of passing recessive genetic conditions to children, and a preconception session can help quantify that risk. It just has no effect on whether the marriage can be performed here.