Oceanside Photo and Telescope Astronomical Society
- Club information, calendar, and articles.
- http://www.optastroclub.com/

San Francisco Amateur Astronomers
- Bulletin board, meetings, lectures, star parties, calendar, newsletter, and photography.
- http://www.sfaa-astronomy.org/

Polaris Observatory Association
- Provides telescope and camera information, gallery, and astrophotography information.
- http://www.frazmtn.com/~polaris/

Western Amateur Astronomers
- News, membership information, and history.
- http://www.waa.av.org/

The Tule River Amateur Astronomers
- History, meeting information, star parties, events, projects, and resources located at Springfield.
- http://www.astrospringville.org/TRAA/

Southern California Observers
- Features a newsletter, chat, observing program, and star parties located at Simi Valley.
- http://www.cometman.net/sco/

Sonoma County Astronomical Society
- Calendar, events, activities, beginners information, and gallery located at Santa Rosa.
- http://www.sonomaskies.org/

San Francisco Sidewalk Astronomers
- Observation information, stories, and telescope information.
- http://www.sfsidewalkastronomers.org/

San Bernardino Valley Amateur Astronomers
- News, calendar, observer information, gallery, star parties, and projects.
- http://www.sbvaa.org/

The Local Group Astronomy Club
- General information, calendar, and observing information located at Santa Clarita.
- http://www.lgscv.org/

High Desert Astronomical Society
- Information on membership, meetings, activities, equipment, calendar, and includes a gallery and forum located at Apple Valley.
- http://www.hidasonline.com/

Colorado River Astronomy Club
- Beginners information, astronomy hazards, events, and gallery located at Blythe.
- http://home.earthlink.net/~astroclub/

Astronomical Society of the Desert
- Calendar of events, photos, history lecture meeting schedule, movies, and special events located in Palm Desert.
- http://www.astrorx.org/

The Antelope Valley Astronomy Club
- Calendar, observing and planetarium information, essay contest winners, and photos located at Lancaster.
- http://www.avastronomyclub.org/

The Planetary Society
- Publications, planetary news, learning center, store, and links located in Pasadena.
- http://planetary.org/home/

Sidewalk Astronomers
- News, telescope information, gallery, forum, store, and space information.
- http://sidewalkastronomers.com

Astronomy Club at University California Davis
- Schedule, gallery, public viewing sessions, talks, news, and links.
- http://maxwell.ucdavis.edu/~astro/

Astronomical Society of the Pacific
- News publication, events, education, resources, support, and astro shop in San Francisco.
- http://www.astrosociety.org

Ventura County Astronomical Society
- Offering monthly meetings, equipment loan, events, monthly calendar of sky watching, and contacts located at Moorpark College.
- http://www.vcas.org/

Stockton Astronomical Society
- Activities, services, newsletter, astro-kid section, gallery, and links.
- http://astro.sci.uop.edu/~sas/

Santa Cruz Astronomy Club
- Meetings, viewing nights, calendar, and links.
- http://astro.santa-cruz.ca.us

San Mateo County Astronomical Society
- General meetings, calendar of events, news, and newsletter located at the College of San Mateo.
- http://www.smcas.com/

San Jose Astronomical Association
- Star parties, lunar eclipse information, hints for beginners, star party etiquette, and activities.
- http://www.sjaa.net

San Diego Astronomy Association
- Outreach, events, resources, merchandise, utilities, and telescope loaner utility page.
- http://www.sdaa.org/

Riverside Astronomical Society
- Star parties, monthly meetings, public outreach, telescope making and other activities.
- http://www.rivastro.org/

Peninsula Astronomical Society
- Provides courses, news, evening and solar viewing information, and special viewings located in Los Altos.
- http://www.foothill.fhda.edu/ast/pas.htm

Orange County Astronomers
- Located in Costa Mesa and provides calendar, e-zine, resources, and gallery.
- http://www.ocastronomers.org/

Mountain Skies Astronomical Society
- Gift shop, astronomy village, star atlas, calendar of events, news, and basic information located at Lake Arrowhead.
- http://www.mountain-skies.org

Mount Diablo Astronomical Society
- Public program, newsletter, meetings, outreach program, gallery, and satellites based in Walnut Creek.
- http://www.mdas.net

Los Angeles Valley College Astronomy Group
- Club calendar, planetarium, and scrapbook.
- http://www.astrophys-assist.com/lavc/

Los Angeles Astronomical Society
- Star parties, activities, programs, bulletin, and gallery.
- http://www.laas.org

Fremont Peak Observatory Association
- The only California State Parks cooperative association devoted to interpreting astronomy to the public, and includes information and weather reports for visitors located in San Juan Bautista.
- http://fpoa.net

The Eastbay Astronomical Society
- Astro advice, constellation chronicles, newsletter, workshop, schedule, and gallery located in Oakland.
- http://www.eastbayastro.org

Central Valley Astronomers
- Calendar, newsletter, forum, meetings, star party etiquette, photographs, and club photo located in Fresno.
- http://www.cvafresno.org

Santa Barbara Astronomical Unit
- Monthly events calendar, night sky, events, newsletter, archive, photo album, classifieds, and dark sky sites.
- http://www.sbau.org/