Louisiana Revised Statutes Tit. 33, § 1411. Reapportionment required after each decennial census;  effective date

A. All parish governing authorities the form of government of which provides for the election of all or part of its members from wards, districts or other subdivisions shall within six months after the official release of every decennial census, examine the apportionment plan of its body to determine if there exists any substantial variation in the representation of the election districts.  After this examination the body shall by ordinance adopted by a majority of the members thereof, either declare its apportionment to be equitable and continue its existing apportionment plan or provide for a new apportionment plan.

B. If reapportionment be necessary it shall be made effective at the end of the term of the incumbent officials.

C. The boundaries of any election district for a new apportionment plan from which members of the parish governing authority are elected shall contain whole election precincts established by the parish governing authority under R.S. 18:532 or 532.1.