“Districts” shall consist of the following:
(a) District 1 consists of Imperial and Riverside Counties.
(b) District 2 consists of Los Angeles, Orange, San Diego, San Luis Obispo, Santa Barbara, and Ventura Counties.
(c) District 3 consists of Fresno, Kern, Kings, and Tulare Counties.
(d) District 4 consists of Monterey County.
(e) District 5 consists of Madera, Merced, and Stanislaus Counties.
(f) District 6 consists of San Joaquin County.
(g) District 7 consists of all counties in the State of California.
The boundaries of any district may be changed by a two-thirds vote of the commission, which is concurred in by the secretary. These boundaries need not coincide with county lines.