Mo. Rev. Stat. § 451.120: Penalty for solemnizing marriage without license, or failing to keep a record thereof.

Any person who shall solemnize any marriage wherein the parties have not obtained a license, as provided by this chapter, or shall fail to keep a record of the solemnization of any marriage, shall be deemed guilty of a misdemeanor, and upon conviction shall be fined not exceeding five hundred dollars, and in addition shall be subject to a civil action by the parent, conservator or other person having care or custody of the person so married, to whom services are due wherein the recovery shall not exceed the sum of five hundred dollars; and any recorder who shall issue a license contrary to the provisions of this chapter shall be subject to a like punishment.