Mo. Rev. Stat. § 72.110: Jurisdiction to remain same.

The jurisdiction of any city which shall be reorganized under this chapter shall not in any wise be affected or changed in consequence of such reorganization, but such limits, wards and boundaries shall remain after such reorganization the same as before such reorganization; and all laws or parts of laws or ordinances, not inconsistent with the provisions of the chapter dealing with the class into which such city is reorganized, which were operative in such city prior to its reorganization, shall continue to be in force until repealed or otherwise changed by ordinance.