La. Stat. tit. 33 § 145
Current with changes from the 2024 legislative session effective on or before 7/1/2024, from Acts 1-3, 6-671
If two-thirds of the total vote cast at the election in each parish is in favor of the ordinance changing the boundary line, then the boundary line shall be changed as set forth in the ordinance.
La. R.S. § 33:145