Santa Cruz Mountains Trail Association
- Conducts hikes and trail maintenance in the San Francisco Bay area. Includes list of activities and membership information.
- http://www.scmta-trails.org/

Orinda Hiking Club
- History of organization, membership information, hike schedule, and photos. Based in San Francisco Bay Area.
- http://www.orindahiking.org/

Desert Trails Hiking Club
- Leads hikes in and around the Coachella Valley. Includes newsletter, calendar of events, and membership application. Based in Palm Desert.
- http://www.deserttrailshiking.com/

Coastwalk
- Vision is to complete the California Coastal Trail, which will stretch from Oregon to the Mexican border. Includes history of organization and events schedule. Based in Sebastopol.
- http://www.coastwalk.org/

Coachella Valley Hiking Club
- Mission statement, schedule of upcoming hikes, trail descriptions, and photos from recent hikes. Based in Palm Springs.
- http://www.cvhikingclub.net/

San Gabriel Mountains Trailbuilders
- All-volunteer group dedicated to constructing and maintaining trails in the Angeles National Forest. Find information on projects, photos, links, and contacts.
- http://www.sgmtrailbuilders.org/

Stanford Outing Club
- Includes information about their past and future trips, photos, and driving directions to selected trailheads. Based in Palo Alto.
- http://www.stanford.edu/group/outing/