Mo. Rev. Stat. § 47.300: Notice of the holding of courts at new county seat.

As soon as convenient buildings for the holding of courts, together with a good and sufficient jail, can be had at such new seat of justice, the county commission shall notify the judges of the several courts holden in the county, at the next term thereof, who shall cause the sheriff to make proclamation at the courthouse door, in term time, that such court will thereafter be held at the place so selected.