California Oaks Foundation
- Non-profit educational organization committed to preserving the state's oak forest ecosystem and its rural landscapes.
- http://www.californiaoaks.org/

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.
- http://www.hearstranchconservation.org/

Save Gateway Valley
- Campaign to save a wildlife corridor from development.
- http://www.gailwilliams.com/savegateway/

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.
- http://www.venturahillsides.org

Friends of Salk Coastal Canyon
- Working to save one of the last coastal canyons in California and Louis Kahn building masterpiece from Salk Institute expansion for an athletic club, parking lot, and offices.
- http://www.friendsofsalkcanyon.com/

Save Joshua Tree National Park
- Group trying to protect natural resources in Joshua Tree National Park from being endangered by an 8,000 acre new city, proposed to be built on pristine desert land that has listed endangered plants and animals.
- http://www.savejoshuatree.com/

California Open Space
- News from around California about public and private efforts to buy open space and habitat.
- http://www.californiaopenspace.com/

HOPE
- Environmental science, law, and public participation resources to assist USA citizens advocate for protection of natural land, air and water ecosystems.
- http://www.1hope.org/

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 p
- http://www.ventanawild.org/

Mount Shasta Bioregional Ecology Center
- Working to protect the natural environment of Mount Shasta and its surrounding areas in Northern California.
- http://www.mountshastaecology.org/

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.
- http://www.sonomawetlands.org

Stable Slopes Forever
- An association of citizens from Southern Humboldt County California, dedicated to preserving and restoring the South Fork Eel River Watershed.
- http://www.stableslopes.com/

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.
- http://defendthebay.org/

Save Haskell's Beach
- Dedicated to the preservation of Santa Barbara County's threatened Gaviota Coast.
- http://ourworld.cs.com/Npst31229/index.html

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.
- http://www.saveballona.org

Wildlife Heritage Foundation
- Protection and restoration of wildlife habitat on lands conserved for the benefit of future generations.
- http://www.wildlifeheritage.org/

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.
- http://www.preservecalavera.org

Mono Lake Committee
- protection, restoration, and education at Mono Lake, California. Information on natural history, political history and water conservation.
- http://www.monolake.org

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
- http://www.highsierrahikers.org/

California Natural Resources Group
- Campaigning for compliance with the spirit and letter of the USA Endangered Species Act.
- http://www.cnrgonline.com/

California Wilderness Coalition
- This campaign aims to permanently protect all remaining wildlands on federal lands within the state.
- http://www.calwild.org/