Mo. Rev. Stat. § 47.330

47.330. Actions — where and how prosecuted in case of division of county. — When a new county shall be established, or any county line altered, all suits, actions, process, prosecutions and proceedings, civil and criminal, commenced before any court before the time of separation or alteration, shall be proceeded to final judgment and execution; and all writs and process before that time issued out of any court shall be executed and returned in all respects as if such division, separation or alteration had not taken place; and all judgments then rendered or which may be rendered, in any proceedings, civil or criminal, then commenced, all fees, fines, penalties and forfeitures which have been accrued or become due or which accrued in pursuance of any suit, process or proceeding then commenced, all taxes then due or assessed, and all balances and arrearages shall be collected, and the collection thereof be enforced, in the same manner as if such new county had not been established, or such alteration had not been made; and the sheriffs, coroners, constables and collectors, respectively, shall have full power and authority to execute all writs and process, original and judicial, and to collect all moneys, fines, penalties and forfeitures, fees, taxes, balances and arrearages which may be due or become due, and to enforce the payment thereof from any person within their county, as it stood before such division or alteration, in the same manner that they might have done respectively, if such new county had not been established, or such alteration had not been made.

(RSMo 1939 § 13693, A. 1949 H.B. 2005) Prior revisions: 1929 § 12034; 1919 § 9436; 1909 § 3653