“Districts” mean the following:

1. (a) District A consists of the Counties of Fresno, Madera, Butte, Colusa, Glenn, Merced, Placer, Shasta, Solano, Sonoma, Stanislaus, Sutter, Tehama, Yolo, Yuba, and all other counties not included in Districts B, C, D, E, and F.
2. (b) District B consists of that portion of Tulare County located between the northern boundary of Tulare County and a straight east-west line made up and defined by Avenue 384.
3. (c) District C consists of that portion of Tulare County located between Avenue 384, and a straight east-west line made up and defined by Avenue 232.
4. (d) District D consists of that portion of Tulare County located between Avenue 232 and the southern boundary of Tulare County.
5. (e) District E consists of Kern County.

6. (f) District F consists of the Counties of Riverside, San Bernardino, San Diego, San Luis Obispo, Imperial, Los Angeles, Mono, Orange, Santa Barbara, and Ventura.

   The boundaries of any district may be changed by a two-thirds vote of the commission, which is concurred in by the director, to maintain similar total production among the districts and to ensure proper representation by producers. The boundaries need not coincide with county lines.