Mo. Rev. Stat. § 141.390

In any county having more than one courthouse in which are located offices or branch offices of the collector, recorder of deeds, and circuit clerk, respectively, where it is required by law that instruments affecting the title to real estate located within the limits of a certain portion of said county shall be filed for record in the office of the recorder of deeds located in such courthouse, the petition or suit containing a list or lists of delinquent tax bills, constituting liens on real estate located in the same portion of said county as the real estate as to which instruments affecting the title thereto shall be required by law to be filed in the office of the recorder of deeds as aforesaid, shall be filed by the delinquent land tax attorney in the office of the circuit clerk located in the same courthouse.