• Regional: North America: United States: California: Science and Environment  (84)
• Regional: North America: United States: California: Society and Culture  (834)
• Science: Environment: Organizations: Land Trusts: United States: California  (27)
• Society: Issues: Environment: Organizations: National Audubon Society: Regional: United States: California  (36)

• California Natural Resources Group - Campaigning for compliance with the spirit and letter of the USA Endangered Species Act.
• California Oaks Foundation - Non-profit educational organization committed to preserving the state's oak forest ecosystem and its rural landscapes.
• California Open Space - News from around California about public and private efforts to buy open space and habitat.
• California Wilderness Coalition - This campaign aims to permanently protect all remaining wildlands on federal lands within the state.
• Chanslor Wetlands & Wildlife Project, Bodega Bay, California - Ecosystem based approach to California wetland wildlife environmental education in Sonoma County with birdwatching, horseback-riding and Native American sites in wine country.
• Defend The Bay - A California nonprofit 501 Corporation, founded in 1995 to help protect Newport Bay and public areas from detrimental influences affecting public health and the environment.
• Hearst Ranch Conservation Project - Dedicated to the preservation of a threatened area. Describes its conservation value and includes news, photographs and events, a record of achievements, and opportunities to join and take action.
• High Sierra Hikers Association - The High Sierra Hikers Association is a nonprofit association dedicated to educating its members and the general public about issues affecting hikers in the High Sierra area of the Sierra Nevada mountains in California, USA
• Mono Lake Committee - protection, restoration, and education at Mono Lake, California. Information on natural history, political history and water conservation.
• Mount Shasta Bioregional Ecology Center - Working to protect the natural environment of Mount Shasta and its surrounding areas in Northern California.
• Preserve Calavera - Preserve Calavera's mission is to protect and preserve the open space around North San Diego Counties Mount Calavera and Lake Calavera as habitat for native plants and animals.
• Save Gateway Valley - Campaign to save a wildlife corridor from development.
• Save Haskell's Beach - Dedicated to the preservation of Santa Barbara County's threatened Gaviota Coast.
• Save the Ballona Wetlands - Information about how individuals can work to stop the development of one of the last remaining habitats for many endangered species ion the Los Angeles Basin area of California.
• Stable Slopes Forever - An association of citizens from Southern Humboldt County California, dedicated to preserving and restoring the South Fork Eel River Watershed.
• Ventana Wilderness Alliance (VWA) - A grassroots conservation and advocacy organization dedicated to preserving the public lands of central California's Santa Lucia Mountains and Big Sur Coast. Provides a public forum, trail condition reports, quarterly journal, and information on current projects.
• Ventura Hillsides Conservancy - A non-profit land trust dedicated to the permanent preservation of hills, canyons, and open space surrounding the city. Includes maps and aerial photographs, habitat information, press releases, opportunities to help, and contact details.
• Wildlife Heritage Foundation - Protection and restoration of wildlife habitat on lands conserved for the benefit of future generations.

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