Before you marry in Missouri, you must obtain a marriage license from the Recorder of Deeds office in any Missouri county. Both bride and groom must appear at the same time. Both will need to provide picture identification and age. If there are previous marriages, the date(s) that the last marriage(s) ended must be provided, and a period of 30 days must pass before applying for a marriage license.
If either of you are under 18 years of age, you must have the consent from a custodial parent or your legal guardian. If you are under 15 years of age, you will need the approval of a county judge. However, according to State law, he/she can only grant approval due to "good cause" or that the conditions surrounding the situation make the marriage "advisable."
Missouri marriage licenses are valid for 30 days.
Here are some links for local counties:Ste. Genevieve County