Mo. Rev. Stat. § 59.021

A candidate for county recorder where the offices of the clerk of the court and recorder of deeds are separate, except in any city not within a county or any county having a charter form of government, shall be at least twenty-one years of age, a registered voter, and a resident of the state of Missouri as well as the county in which he or she is a candidate for at least one year prior to the date of the general election. Upon election to office, the person shall continue to reside in that county during his or her tenure in office. Each candidate for county recorder shall provide to the election authority a copy of an affidavit from a surety company authorized to do business in this state that indicates the candidate is able to satisfy the bond requirements under section 59.100.