Allied Signal Aerospace Company Macintosh Users Group: Torrance, CA. Offers information on membership and meetings.
ASP Developers' Special Interest Group: ASP user group in Los Angeles, California.
CLUG: Cerritos Linux Users Group.
CVMUG: Simi Valley, CA. Bookstore, calendar, links, meeting, message board, news, reviews, and tutorials.
HIDACC Apple Computer Club: Lancaster, CA. Includes newsletter, meeting schedule, software library, and member resources.
Los Angeles Java Users' Group (LAJUG): Includes meeting history, directions, mailing list signup, and job listings.
Los Angeles Linux User Groups: Umbrella site for all Los Angeles Linux User groups. Links and information about upcoming events.
Los Angeles Macintosh Group: Community overview, including forum access.
Los Angeles Palm/Portable Users Group: Meeting notes and mailing list.
Los Angeles Perl Mongers: user group for the Perl programming language
LULA: Linux Users of Los Angeles.
MacValley Users Group: Northridge, CA. Offers information on meetings, becoming a member, links, and hands-on seminars.
Raytheon/Hughes Mac Users Group: A corporate Yahoo users group with message board and mailing list.
San Gabriel Valley Mac Users Group: Pasadena, CA. Includes mailing lists, special interest groups, links, and membership information
SGVLUG: San Gabriel Valley Linux Users Group (Altadena)
Simi-Conejo Linux User's Group: Linux Users Group for the Simi and Conejo Valleys in Southern California.
Southern California Macintosh Owners/Users Group: SMOG offers meeting minutes and schedules, membership information, and useful links.
Southern California Wireless Users Group: Wireless users group in California, USA, with a focus on data communications using wireless technology. Contact and meeting information, streaming video archive of meetings and presentations.
Thousand Oaks Personal Computer Club: This California, USA, based club is open to all people, young and old, from beginners to advanced. Meeting information and contact details.
USCLUG: University of Southern California Linux Users Group.