What Is Common-Law Marriage?

A common-law marriage is a type of marriage recognized in some U.S. states, even without a marriage license or ceremony.
Under common law, a couple can be considered legally married if they live together for a significant period, present themselves as a married couple, and meet the state’s specific requirements.
In other words, even without an official marriage certificate, the law might treat long-term partners as spouses — but only in states that allow it.