La. Stat. tit. 33 § 202
When a consolidation becomes effective the constituent municipalities shall consolidate and become one municipality under the name set forth in the election ordinances. The charter or other laws for the government of the constituent municipality having the largest population shall be the charter or the laws for the government of the whole of the consolidated territory until modified or repealed.
The ordinances, resolutions, and other measures of the constituent municipality having the largest population according to the last preceding federal census, shall remain in force and shall extend to and be enforced throughout the whole of the consolidated territory, but all ordinances, resolutions and other measures of the lesser municipality shall cease to be operative when consolidation takes effect, except zoning ordinances therein which shall remain in effect until repealed, modified, or amended by the governing body of the consolidated municipality.
La. R.S. § 33:202