- Region1...Serving: Mendocino, Lake, Sonoma, Napa, Solono, and Marin Counties
- Region 2..Serving: Tehama, Plumas, Glenn, and Butte Counties
- Region 3...Serving: Sutter, Placer, Yolo, Sacramento, Colusa, El Dorado, Sierra, Yuba, and Nevada
Counties
- Region 4...Serving: Stanislaus, San Joaquin, Merced, Mono, Alpine, Amador, Calaveras, Mariposa & Tuolumne Counties
- Region 5...Serving: Alameda and Contra Costa Counties.
- Region 6...Serving: San Francisco, San Mateo, Santa Clara, and Santa Cruz Counties.
- Region 7...Serving: Los Angeles County
- Region 8...Serving: San Diego and Imperial Counties
- Region 9...Serving: Ventura and Angeles National Forest
- Region 10..Serving: Central Coast, including Monterey, San Benito, and parts of Santa Cruz
- Region 11..Serving: Riverside County
- Region 12..Serving: Orange County
- Region 13..Serving: Del Norte and Humbolt Counties
- Region 14..Serving: San Bernardino Counties
- Region 15...Serving: Fresno and Madera Counties
- Region 16...Serving: Kern and Inyo Counties
- Region 17...Serving: Kings and Tulare Counties
- Region 18...Serving: Shasta, Siskiyou, Modoc, Trinity and Lassen Counties.
- Region 19...Serving: San Luis Obispo and Santa Barbara Counties
- Region 20...Region Twenty {20} first established at the CSHA Quarterly Executive Committee meeting on July 25, 1992 was abandoned by action approved at the January 2004 Quarterly Meeting of the CSHA Executive Committee.
