CAL. GOV. CODE § 69100 : California Code - Section 69100

The state is divided into six court of appeal districts designated and constituted as follows:

(a) The Counties of San Francisco, Marin, Sonoma, Napa, Solano, Lake, Mendocino, Humboldt, Del Norte, Contra Costa, Alameda, and San Mateo shall constitute the First Appellate District.

(b) The Counties of San Luis Obispo, Santa Barbara, Ventura, and Los Angeles shall constitute the Second Appellate District.

(c) The Counties of Siskiyou, Modoc, Trinity, Shasta, Lassen, Tehama, Plumas, Colusa, Glenn, Butte, Sierra, Sutter, Yuba, Nevada, Yolo, Placer, Sacramento, El Dorado, San Joaquin, Amador, Calaveras, Alpine, and Mono shall constitute the Third Appellate District.

(d) The Counties of Inyo, San Bernardino, Riverside, Orange, San Diego, and Imperial shall constitute the Fourth Appellate District.

(e) The Counties of Stanislaus, Tuolumne, Merced, Mariposa, Madera, Fresno, Kings, Tulare, and Kern shall constitute the Fifth Appellate District.

(f) The Counties of Santa Clara, Santa Cruz, Monterey, and San Benito shall constitute the Sixth Appellate District.