Texas Government Code - GOV'T § 24.948. Effect of Reapportionment

(a) After the effective date of a reapportionment order, the judicial districts affected by the order contain only the counties designated for the judicial districts in the reapportionment order, and the district courts shall have and exercise jurisdiction coextensive with the newly defined limits of the judicial districts in all actions, proceedings, matters, and causes of which district courts have jurisdiction under the constitution and laws of the state.

(b) If a county in which any part of the jurisdiction vested by general law in the county court has been transferred or made concurrent in a district court is removed by reapportionment under this subchapter from the judicial districts of all district courts having the county court jurisdiction, the board shall specify whether, after the effective date of the reapportionment order, the transferred county court jurisdiction is vested in the district court of the judicial districts in which the county is included under the reapportionment order or whether the transferred county court jurisdiction is revested in the county court.

(c) If the office of district attorney is authorized by law in or for a judicial district, a reapportionment under this subchapter does not change the county or counties included in the district for purposes of election, functions, duties, and authority of the district attorney, his assistants, and their successors in office.