The state of Jefferson
would be created from the far north part of California, bordering Oregon, and would consist of fourteen counties: Butte, Colusa, Del Norte, Glenn, Humboldt, Lake, Lassen, Mendocino, Modoc, Plumas, Siskiyou, Shasta, Tehama, and Trinity.
The state of North California
would be south of Jefferson spanning from the Pacific Ocean to Nevada. North California would consist of thirteen counties: Amador, El Dorado, Marin, Napa, Nevada, Placer, Sacramento, Sierra, Solano, Sonoma, Sutter, Yolo and Yuba.
The state of Silicon Valley
would span the coastline from San Francisco to Monterey. It would consist of eight counties: Alameda, Contra Costa, San Benito, San Francisco, San Mateo, Santa Clara, Santa Cruz and Monterey.
The state of Central California
would be between Silicon Valley and Nevada. It would consist of the fourteen counties north of Los Angeles and south of Sacramento: Alpine, Calaveras, Fresno, Inyo, Kern, Kings, Madera, Mariposa, Merced, Mono, San Joaquin, Stanislaus, Tulare and Tuolumne.
The state of West California
would be south of Silicon Valley and Central California, and west of San Bernardino County. It would consist of four counties: Santa Barbara, San Luis Obispo, Los Angeles and Ventura.
The state of South California
would be made up of the southernmost part of the state. It would consist of five counties: Imperial, Orange, Riverside, San Bernardino and San Diego.Source: Wikipedia