Common-Law Marriage – The 9 States Where You’re Married Without Knowing It
What Is Common-Law Marriage?
Most people think marriage only happens one way — you get a license, have a ceremony, and sign some paperwork. But in several U.S. states, you can actually become legally married without doing any of that. It’s called common-law marriage, and it catches a surprising number of couples completely off guard.
Common-law marriage is a legal arrangement where two people are considered married by the state simply because of how they live together and present themselves to the world — no ceremony, no marriage license, no officiant required. The relationship is treated exactly like a formal marriage in the eyes of the law, which means it comes with all the same rights, responsibilities, and complications when it ends.
If you live in one of the states that still recognizes common-law marriage, you could already be legally married without realizing it. That’s not a scare tactic — it’s something family law attorneys deal with regularly. Understanding how this works could save you from some very serious legal surprises down the road.
The 9 States Where Common-Law Marriage Still Exists
While many states have abolished common-law marriage over the years, a handful still recognize it. Here are the states where you need to pay close attention:
- Colorado
- Iowa
- Kansas
- Montana
- New Hampshire (for inheritance purposes only)
- Oklahoma
- Rhode Island
- South Carolina
- Texas
- Utah
Wait — that’s actually 10 entries on the list. You’re right to notice that. The reason the headline says nine is that New Hampshire’s recognition is extremely limited, applying only in specific inheritance situations after death. It functions very differently from the others. Depending on how you count it, the number ranges from nine to ten, but every single one of these states deserves your attention if you live there or have lived there.
Additionally, Washington D.C. also recognizes common-law marriage, so residents of the nation’s capital are included in this conversation as well.
What Are the Requirements for a Common-Law Marriage?
Common-law marriage doesn’t happen just because you’ve been dating someone for a long time or living together for a few years. There are specific legal requirements that vary by state, but most states that recognize common-law marriage look for a combination of the following factors:
1. You Must Both Be Legally Eligible to Marry
Both individuals must be of legal age and must not already be married to someone else. If either person is currently in another legal marriage, a common-law marriage cannot be formed. This requirement mirrors the same eligibility standards used in formal marriages.
2. You Must Live Together
Cohabitation is typically a core requirement. You need to actually share a home and live as a couple. Simply spending a lot of time at each other’s places usually doesn’t count. The living arrangement needs to reflect a genuine, ongoing domestic partnership.
3. You Must Present Yourselves as Married to Others
This is one of the most important — and most misunderstood — requirements. States look at whether the couple holds themselves out as married to friends, family, coworkers, and the general public. This can include things like:
- Introducing your partner as your husband or wife
- Using the same last name
- Filing joint tax returns
- Listing each other as spouses on insurance forms, emergency contacts, or beneficiary designations
- Wearing wedding rings
- Referring to yourselves as married on social media
4. You Must Intend to Be Married
Many states require that both parties mutually agree that they are in a marital relationship. This doesn’t have to be a formal agreement, but there must be a shared understanding that the relationship is a permanent, committed, marriage-like arrangement.
No single factor alone is usually enough to establish a common-law marriage. Courts typically look at the full picture of the relationship when making this determination.
How Long Do You Have to Live Together?
Here’s one of the biggest myths about common-law marriage: there is no universal “seven-year rule” or any specific time requirement in most states. You may have heard that living together for seven years automatically makes you common-law married. That is simply not true.
The length of cohabitation can be a factor that courts consider, but it’s not a magic number that triggers legal marriage. A couple could theoretically establish a common-law marriage in a shorter time if all the other requirements are met, and conversely, two people could live together for decades and not be considered common-law married if they never held themselves out as a married couple.
The length of the relationship matters primarily as evidence of the couple’s intent and commitment — not as a standalone requirement.
State-by-State Breakdown of Key Differences
While the general framework is similar across states, there are important differences in how each state applies the law. Here’s a closer look at a few key states:
Texas
Texas calls it an “informal marriage” rather than common-law marriage, but the concept is the same. Texas even has a formal registration process where couples can officially declare their informal marriage with the county clerk. Without registration, Texas courts will examine whether the couple agreed to be married, lived together in Texas, and represented to others that they were married.
Colorado
Colorado is one of the more active states when it comes to common-law marriage disputes. Colorado courts look at the totality of the circumstances and have historically been fairly willing to find a common-law marriage when the evidence supports it. The state updated its standards in 2021, placing greater emphasis on the couple’s conduct and mutual understanding of the relationship.
South Carolina
South Carolina recognizes common-law marriage but has been gradually moving toward restricting it. Couples and legal experts in the state should stay updated on any legislative changes, as the state has debated abolishing the practice in recent years.
Iowa
Iowa has recognized common-law marriage for well over a century. The state requires continuous cohabitation and a public declaration of the marital relationship. Iowa courts take the requirement of holding oneself out as married quite seriously.
New Hampshire
As mentioned earlier, New Hampshire’s recognition is uniquely limited. The state only acknowledges common-law marriage for inheritance purposes after one of the partners has died. It does not extend to divorce proceedings or many other legal situations that other states cover.
What Happens When a Common-Law Marriage Ends?
This is where things get very serious, very fast. If you are in a common-law marriage — whether you know it or not — and the relationship ends, you cannot simply walk away. You must legally divorce, just like any other married couple.
That means going through the full divorce process, which can include:
- Division of property and assets accumulated during the marriage
- Potential spousal support or alimony obligations
- Custody and child support arrangements if children are involved
- Legal fees and court proceedings
If one partner believes a common-law marriage exists and the other doesn’t, things can get extremely complicated. Courts will have to step in and make a determination based on the evidence of how the couple actually lived and presented their relationship to the outside world.
Even if you never thought of yourself as married, a judge might disagree based on your actions and behavior over the years.
What About States That Don’t Recognize Common-Law Marriage?
If you live in a state that does not recognize common-law marriage, you might assume you’re completely safe. But here’s a critical point that many people miss: most states will recognize a common-law marriage that was validly created in another state.
So if you and your partner lived in Colorado for several years, established a common-law marriage there, and then moved to California (which does not recognize common-law marriage), California courts may still consider you legally married based on the marriage formed in Colorado.
This is known as the full faith and credit principle — states generally honor legal relationships established in other states. If you’ve moved around a lot, it’s worth taking a close look at where you’ve lived and what the laws were there at the time.
Real-Life Situations Where Common-Law Marriage Becomes a Problem
Common-law marriage issues don’t just come up during breakups. Here are some real-world scenarios where legal status can suddenly become very important:
Medical Emergencies
If your partner is hospitalized and cannot make decisions for themselves, their legal spouse typically has priority in making medical decisions. If a common-law marriage is disputed, family members could step in and override your wishes, leaving you with no legal standing.
Death Without a Will
When someone dies without a will, state inheritance laws determine who receives their assets. A surviving common-law spouse may be entitled to a significant share of the estate — or they may be left out entirely if the marriage is disputed. This can lead to bitter legal battles between the surviving partner and the deceased’s blood relatives.
Social Security and Benefits
Federal programs like Social Security recognize common-law marriages for survivor benefits, provided the marriage was valid under state law. If you believe you’re entitled to a deceased partner’s Social Security benefits, you’ll need to prove the marriage was legally valid.
Health Insurance
Many employer-sponsored health plans extend coverage to legal spouses. Whether a common-law spouse qualifies depends on the plan terms and the state’s recognition of the marriage. This can create significant coverage gaps if the relationship isn’t clearly defined.
How to Protect Yourself Regardless of Your Situation
Whether you want to establish a common-law marriage, avoid one, or simply protect your legal rights as an unmarried couple, there are practical steps you can take:
If You Want to Avoid Unintentionally Creating a Common-Law Marriage
- Be careful about language you use to describe your partner in public and on official documents
- Avoid joint tax filings if you are not legally married and don’t intend to be
- Consult a family law attorney if you’re unsure about how your state views your relationship
- Consider a cohabitation agreement that explicitly states you do not intend to be married
If You Are in a Committed Relationship and Want Legal Protections
- Consider formalizing your marriage through the standard legal process to avoid ambiguity
- Create a cohabitation agreement that outlines property rights and financial responsibilities
- Draft a will to ensure your assets go to the people you choose
- Designate your partner as beneficiary on insurance policies, retirement accounts, and other assets
- Create healthcare proxy documents and powers of attorney
How Courts Decide If a Common-Law Marriage Exists
If a common-law marriage is ever disputed in court, a judge will look at a wide range of evidence to make a decision. Some of the things courts commonly examine include:
- Joint bank accounts and shared finances
- Joint ownership of property or real estate
- How the couple introduced each other to others
- Whether a shared last name was used
- How the couple was listed on leases, mortgages, or loan applications
- Tax returns — did they file as married?
- Insurance and beneficiary designations
- Testimony from friends, family, and coworkers about how the couple presented their relationship
- Communications like emails, texts, or social media posts
Courts look at the overall picture. No single piece of evidence is usually enough on its own, but a combination of these factors can build a very strong case for the existence of a marriage — whether either party intended that or not.
The Bottom Line
Common-law marriage is a real legal concept that affects real people, often in ways they never anticipated. If you live in one of the states that still recognizes it, your daily choices — from how you file your taxes to what you call your partner at a dinner party — could have genuine legal consequences.
The best approach is straightforward: know the laws of your state, be intentional about how you present your relationship, and consult with a family law attorney if you have any questions or concerns about your legal status. A brief conversation with a qualified legal professional can save you from enormous complications later on.
Whether you’re trying to establish a common-law marriage, protect yourself from accidentally creating one, or simply understand your current legal standing, knowledge is your most powerful tool. Don’t let a law you didn’t know about define your life in ways you never intended.
