Bigamy is the act of marrying one person while being legally married to another. Polygamy is the practice or custom (often religious) of having more than one wife or husband at a time. Most states prohibit a party from having more than one marriage license at a time, and in most states bigamy is a crime.
In New Hampshire, bigamy is prohibited under state law. According to New Hampshire Revised Statutes Section 639:1, a person is guilty of bigamy if they knowingly contract or purport to contract a marriage with another person when they have a living spouse, or the other person has a living spouse. Bigamy is classified as a Class B felony in New Hampshire, which can result in severe penalties including imprisonment and fines. Polygamy, which involves having more than one spouse simultaneously, is also not legally recognized in New Hampshire and falls under the prohibition against bigamy. The state does not issue marriage licenses to individuals who are already married, and all parties must be legally eligible to marry, which includes being single, divorced, or widowed.