Missouri Marriage Laws in 2026: What You Really Need to Know
Planning to get married in Missouri? Or maybe you’re just curious about the rules? Either way, you’re not alone. Tons of people have questions about marriage laws, and honestly, the requirements aren’t always obvious.
Here’s the thing: Missouri has pretty straightforward marriage laws. But there are definitely some rules you need to follow. Get them wrong, and you could end up with a marriage that isn’t legally valid. Let’s break down exactly what Missouri requires so you know what to do.
What Is a Legal Marriage in Missouri?
Before we dive into the specific rules, let’s talk about what makes a marriage actually valid in Missouri. A legal marriage isn’t just about saying “I do” in front of people you love. It’s about meeting the legal requirements the state sets up. When you follow Missouri’s rules, your marriage gets recognized by the government, the courts, and basically everyone.
Basically, a legal marriage means the state officially recognizes you and your spouse as married partners. Pretty straightforward, right? This matters for things like taxes, insurance, inheritance, and a whole bunch of other stuff. So yeah, you want to do this right.
Basic Missouri Marriage Requirements
Age Requirements
Let’s start with age. This one’s important. In Missouri, you must be at least 18 years old to get married without parental consent. No exceptions there.
But wait, there’s more. If you’re 15, 16, or 17, you can still get married. But you need parental consent. Both your parents (or your legal guardian) have to sign off on it. This is one of those rules that surprises people, honestly. Many states have moved away from allowing teen marriages entirely, but Missouri still permits them with parental permission.
If you’re under 15? You cannot get married in Missouri. Period. No parental consent changes that rule.
Mental Capacity
Here’s one people don’t always think about: you have to be mentally capable of getting married. This means you need to understand what marriage actually means and what you’re agreeing to. If someone has been declared mentally incompetent by a court, they cannot legally marry.
This rule exists to protect people. It’s basically the state saying, “You need to understand this decision.” Makes sense, right?
No Close Relatives
Missouri prohibits marriages between certain relatives. You cannot marry your parent, grandparent, sibling, aunt, uncle, niece, or nephew. These are your direct relatives, and the law is clear: no marriages between these family members.
What about cousins? Cousins can marry in Missouri. Yep, that’s legal here. This surprises some people, but it’s the law.
Previous Marriage Status
If you were previously married, your last marriage has to be officially over before you get married again. This means your divorce was finalized, or your spouse passed away. You can’t just decide your last marriage is over in your heart. The court has to say it’s over.
The Marriage License: Your Golden Ticket
Now here’s where things get practical. In Missouri, you absolutely must get a marriage license before you can have a legally valid wedding ceremony. This is non-negotiable. No license, no legal marriage. Period.
Getting Your Marriage License
To get a marriage license in Missouri, you both need to go to the circuit court in the county where you’re getting married. Some counties allow you to apply online first, which is pretty convenient. But eventually, you’ll need to appear in person.
You’ll need to bring specific documents. Valid government ID is required for both of you. This could be your driver’s license, passport, or another official ID. You’ll also need to provide proof of your age. Your birth certificate usually works perfectly for this.
Here’s something important: there is no waiting period in Missouri. None. You can get your license and get married on the same day if you want to. This is different from some other states that require you to wait a few days. Not Missouri though.
Marriage License Validity
Once you get your marriage license, you have 30 days to actually use it. You need to get married within that 30-day window. If you don’t get married within 30 days, your license expires. You’d have to apply for a new one.
The license costs vary slightly by county, but it’s usually somewhere between $40 and $65. Pretty affordable, honestly.
Who Can Perform Your Wedding Ceremony
Here’s something cool: in Missouri, several types of people can legally perform your wedding ceremony. You’ve got options.
An ordained minister, priest, or rabbi can perform your ceremony. These are the traditional choices. Judges and other court officials can marry you too. Even a notary public can perform a wedding ceremony in Missouri. Some people don’t realize that last one, but it’s true.
The person performing the ceremony just needs to be authorized to do it. After the ceremony, they need to sign your marriage license and return it to the court. That’s the official paperwork that makes it all legal.
Hold on, this part is important. The person performing the ceremony doesn’t get to decide whether you’re legally qualified to marry. They’re not checking your age or family relationship. That responsibility falls on you and your future spouse. You’re stating that you meet all the legal requirements. If you don’t, that’s on you, not on whoever performs the ceremony.
What About Common Law Marriage?
Wait, you might be thinking: “Can I just marry someone without all this paperwork?” Missouri doesn’t recognize common law marriage. Not anymore. If you just live together for a certain number of years and call yourselves married, that doesn’t make you legally married in Missouri.
This changed years ago. Missouri used to recognize common law marriage, but they got rid of that option. Now you have to follow the official process. You need that license. You need someone authorized to perform the ceremony. You need the paperwork filed with the court. No shortcuts.
What Happens After the Ceremony
Here’s the part people sometimes forget: your wedding ceremony isn’t actually complete, legally speaking, until the paperwork gets filed. After your ceremony, the person who performed it needs to sign the license. Then they send it back to the circuit court in your county.
The court records your marriage. Now you’re officially married. If you need a marriage certificate later, you can get copies from the court. You’ll probably need this for things like changing your name, updating insurance, or applying for joint accounts.
The state usually provides you with one certified copy of your marriage certificate during this process. Keep it somewhere safe. You’ll want it for later.
Changing Your Name After Marriage
So you’re getting married. Are you planning to change your name? In Missouri, you can change your name after marriage, but you have to go through a legal process. Getting married doesn’t automatically change your name.
If you want to change your name, you have a couple options. You can file for a name change through the court. Or some people just start using their new name socially and update it on their licenses, social security cards, and other documents. But legally? Going through the court process is the cleaner way to do it.
This applies whether you’re the spouse taking a new last name or if you’re both changing to a different name entirely. The process is the same.
Divorce and Separation Laws
Okay, we’re going to be real here for a second. It’s not fun to think about, but you should know: if things don’t work out, Missouri is a no-fault divorce state. This is actually good news if your marriage is ending.
In Missouri, you don’t have to prove your spouse did something wrong to get divorced. You can just say the marriage is irretrievably broken, and that’s enough. You don’t need to prove infidelity, abuse, or anything else. Just that the relationship is over.
There is a waiting period for divorce in Missouri, though. You have to wait 30 days after filing before the divorce can be finalized. This gives people a little time to think things through.
Property Division
When you get divorced in Missouri, the state uses something called “equitable distribution.” This doesn’t mean your stuff gets split 50-50. It means the court divides your property fairly, but not necessarily equally.
The court looks at a bunch of factors. How long were you married? What did each person contribute? What does each person need? The court tries to be fair, but fair doesn’t always mean exactly equal.
Prenuptial and Postnuptial Agreements
Have you heard of prenups? Short for prenuptial agreements. It’s basically a contract you sign before you get married. In it, you can say how you want your property divided if you get divorced, who gets what, and stuff like that.
Missouri allows prenuptial agreements, but they have to meet certain requirements. Both people have to fully understand what they’re signing. Both people need to sign voluntarily, without pressure. And the agreement can’t be unfair to the point of being ridiculous.
Prenups protect people, honestly. They can save a ton of money and heartache if a marriage doesn’t work out. You can also sign a postnuptial agreement after you get married, which is basically the same thing, just signed later.
These agreements aren’t just for rich people, by the way. Anyone can benefit from clarifying who owns what. Especially if you’re bringing kids or significant assets into the marriage.
Same-Sex Marriage in Missouri
Since 2015, same-sex couples have the right to marry in Missouri, just like opposite-sex couples. This was a major legal change at the federal level, and Missouri follows that law.
Same-sex couples need to follow the exact same requirements as everyone else. Age restrictions, license requirements, the waiting period (or lack thereof), all of it applies the same way. Your marriage is treated exactly the same under Missouri law.
Military and Out-of-State Considerations
If you or your spouse is in the military, there are some special considerations. Military couples can often marry faster and with fewer complications. But the basic Missouri requirements still apply if you’re getting married in Missouri.
What if you’re getting married in another state? Here’s the thing: Missouri recognizes marriages that are valid in other states. If you get married legally in another state, Missouri will recognize that marriage. This is really important to know.
The same goes the other way. If you get married in Missouri legally, other states will recognize it. So don’t worry about having to get remarried if you move.
Frequently Asked Questions
Do I need a blood test to get married in Missouri?
Nope. Missouri stopped requiring blood tests for marriage licenses years ago. Some people think this is still a requirement, but it’s not. You don’t need any medical tests to get your license.
Can my friend who isn’t a minister marry us?
Not legally. Missouri requires that the person performing your ceremony be specifically authorized to do it. That includes ordained ministers, judges, court officials, and notary publics. Your best friend, unfortunately, doesn’t qualify. But a notary is pretty affordable if you need someone.
What if we get married without a license?
Your marriage wouldn’t be legally valid. No license means no legal marriage, according to Missouri law. Any kids, property, inheritance rights, taxes—all of that gets complicated without a legal marriage. Don’t skip this step.
Is there a maximum age to get married in Missouri?
No. There’s a minimum age (you have to be at least 18 or have parental consent), but there’s no maximum age. You can get married at any age if you’re legally able.
What about marriage equality in Missouri?
Same-sex couples have the full right to marry in Missouri and receive all the same legal benefits as different-sex couples. This has been the law since 2015. Period.
Final Thoughts
Marriage laws might seem boring, but they actually matter. They protect you. They clarify your legal rights. They make sure your relationship is recognized by the government.
Here’s what you need to remember: get your license from the circuit court, have someone legally authorized perform your ceremony, and make sure that license gets filed with the court. Do that, and you’re golden.
Not sure about something specific? Ask your local circuit court clerk. They deal with marriage licenses all day and can answer your questions. And if things get complicated, especially if you’re thinking about a prenuptial agreement, talk to a family law attorney.
Now you know the basics. Go plan that wedding. You’ve got this.