La. Stat. tit. 13 § 1455
The provisions of this Chapter shall be applicable to all parish courts, whether established before or after the effective date of this Chapter; however, nothing in this Chapter shall be deemed to change the territorial jurisdiction of the First Parish Court for the Parish of Jefferson and the Second Parish Court for the Parish of Jefferson, which courts were created prior to the effective date of the Constitution of 1974 and thus are exempt from the requirement contained in Article V, Section 15(A) that all trial courts of limited jurisdiction established by the legislature have parishwide territorial jurisdiction; provided, further, that the existing jurisdiction of mayor's or magistrate's courts shall not be affected in those parishes in which parish courts have been established at the effective date of this act.
La. R.S. § 13:1455