Polygamy is not legal in Oregon. State law limits marriage to two people, and any marriage entered into while either party already has a living spouse is automatically void. Attempting a second marriage is the crime of bigamy, a Class C felony that carries up to five years in prison and a fine of up to $125,000.
What Oregon Law Says About Multiple Marriages
Oregon treats marriage as a civil contract between two people who meet the state’s age and capacity requirements and solemnize the marriage through the proper procedure. ORS 106.020 then removes any doubt about a second marriage: it declares a marriage “absolutely void” if either party had a living spouse at the time of the ceremony.1Oregon State Legislature. Oregon Revised Statutes Chapter 106 – Prohibited and Void Marriages
Void means the marriage has no legal effect from the moment it happens. No annulment or court order is required to make it invalid. That said, if you later need to prove you are single — to remarry, transfer property, or qualify for a benefit — you may still want a court judgment confirming the earlier marriage was void.
Oregon also will not recognize a polygamous marriage performed in another state or country. If the second marriage would be void under Oregon law, moving to Oregon does not revive it.
Bigamy Is a Felony in Oregon
Under ORS 163.515, a person commits bigamy by knowingly marrying or claiming to marry someone while either party is already lawfully married.2Oregon State Legislature. Oregon Code 163.515 – Bigamy The word “knowingly” is doing real work. A prosecutor must show you were aware of the prior marriage and knew it had not been legally dissolved. Someone who genuinely and reasonably believed a divorce was final has a stronger defense than someone who never bothered to check.
Bigamy is a Class C felony.2Oregon State Legislature. Oregon Code 163.515 – Bigamy The statutory maximums are:
- Up to 5 years in prison.3Oregon Public Law. Oregon Code 161.605 – Maximum Terms of Imprisonment for Felonies
- A fine of up to $125,000.4Oregon Public Law. Oregon Code 161.625 – Fines for Felonies
Actual sentences depend on criminal history and the circumstances of the offense under Oregon’s sentencing guidelines. A felony conviction also carries collateral consequences that outlast any sentence: trouble with employment, housing, professional licensing, and the loss of firearm rights.
Property and Children When the Marriage Is Void
Because a void marriage is treated as if it never existed, neither party is a “spouse” for Oregon’s marital property rules. If the relationship ends, disputes over shared property, joint debts, and financial contributions have to be sorted out under general contract and equity principles rather than through family court.
There is one narrow protection. Under ORS 108.730, if the parties signed what would have been a premarital agreement, a court can enforce it “to the extent necessary to avoid an inequitable result” even when the marriage turns out to be void.5Oregon State Legislature. Oregon Code 108.730 – Effect of Void Marriage Otherwise, property generally stays with whoever holds legal title.
Children are not penalized for the status of their parents’ marriage. Oregon determines parentage independently, so custody, child support, and parental rights proceed through the same framework used for any other parent.
Is Polyamory Legal in Oregon?
Yes. Oregon has no law criminalizing polyamory itself. The crime is marrying, or claiming to marry, someone while already married. A household of three or more adults who live together and share romantic relationships is not breaking Oregon law, as long as no one tries to obtain a second marriage license.
What polyamorous households cannot do is access the automatic rights of marriage: hospital visitation priority, medical decision-making for an incapacitated partner, inheritance under intestacy law, or joint state tax filing. Oregon’s domestic partnership statute does not fill the gap either, because it is also limited to two people.6Oregon State Legislature. Oregon Code 106.310 – Definitions for ORS 106.300 to 106.340 Powers of attorney, wills, and cohabitation agreements can patch some of these gaps, but they rely on general contract law and do not replicate the full scope of what marriage provides.
Federal Consequences Beyond Oregon Law
Immigration
Under the Immigration and Nationality Act, anyone seeking a permanent resident visa who intends to practice polygamy in the United States is inadmissible, and no waiver is available. This applies across all immigrant visa categories, not just spousal petitions. The focus is intent: having practiced polygamy in the past or holding religious beliefs supporting it does not by itself trigger inadmissibility, but evidence of a plan to maintain multiple marital relationships in the U.S. will. A bigamy conviction can separately be treated as a crime involving moral turpitude.7U.S. Department of State. 9 FAM 302.12 – Ineligibility Based on Other Activities
Taxes and Social Security
The IRS determines filing status based on whether you are legally married on the last day of the tax year.8Internal Revenue Service. Filing Status Only the first valid marriage counts. A second or third partner cannot file jointly, claim spousal IRA contributions, or receive tax-free spousal health insurance coverage from an employer.
Social Security spousal and survivor benefits also require a valid legal marriage. Spousal benefits generally require at least one year of marriage; a divorced spouse claiming on an ex’s record generally needs ten years.9Social Security Administration. What Are the Marriage Requirements to Receive Social Security Spouse’s Benefits? A void polygamous marriage satisfies neither, so additional partners have no Social Security claim through the relationship no matter how long it lasted.