District No. 1. The counties of Colusa, Glenn, Solano and Yolo.
District No. 2. That portion of Sutter County north of a line extending along Franklin Road easterly to the Yuba County line and westerly to the Colusa County line.
District No. 3. That portion of Sutter County south of a line extending along Franklin Road easterly to the Yuba County line and westerly to the Colusa County line.
District No. 4. The counties of Alpine, Amador, Del Norte, El Dorado, Humboldt, Lake, Lassen, Mendocino, Modoc, Napa, Nevada, Placer, Plumas, Sacramento, Shasta, Sierra, Siskiyou, Sonoma, Tehama and Trinity.
District No. 5. All of Butte County.
District No. 6. All of Yuba County.
District No. 7. The counties of Fresno, Kern, Kings, Madera Merced, San Benito, San Joaquin, Santa Clara, Tulare and all other counties not included in Districts 1, 2, 3, 4, 5 and 6.
7 C.F.R. §993.128