Region

Region

Counties

Northern

Siskiyou, Modoc, Shasta, Lassen, Tehama, Plumas, Lake, Glenn, Butte, Sierra, Colusa, Sutter, and Yuba

North Coast

Del Norte, Trinity, Humboldt, Mendocino, and Sonoma

Bay Area

San Francisco, Marin, Napa, Contra Costa, Alameda, San Mateo, and Santa Clara

Sacramento Area

Yolo, Sacramento, Solano, San Joaquin, Alpine, Nevada, Placer, and El Dorado

Inland

Calaveras, Tuolumne, Mono, Amador, Stanislaus, Merced, Mariposa, Madera, Fresno, Inyo, Kings, Tulare, and Kern

Central Coast

Santa Cruz, San Benito, Monterey, San Luis Obispo, Santa Barbara, and Ventura

South Coast

Los Angeles, Orange, and San Diego

Inland Empire San Bernardino, Riverside, and Imperial

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