La. Stat. tit. 3 § 4103
The commissioner shall establish production marketing areas, shall describe the territorial extent thereof, and shall designate the same by name or number. The commissioner may increase or decrease the number of production marketing areas, combine two or more production marketing areas, or alter the boundaries of such areas. In exercising the authority granted by this section, the commissioner shall take into consideration the historical conditions affecting the production, distribution and sale of bulk milk and dairy products in such areas, the need for establishing area boundaries in a manner which will facilitate cooperation between the commissioner and federal authorities engaged in regulating prices paid by processors for bulk milk, and all other factors necessary to effectuate the purposes and policies of this subpart. Nothing contained in this subpart shall prevent the commissioner from including the entire state in one production marketing area.
La. R.S. § 3:4103