National. 200+ chapters. Founded 1965. Organization of parents, professionals and citizens working together via education, advocacy, research for children and adults on the autism spectrum. Magazine, searchable database and annual conference.
Write:
Autism Society of America
4340 East-West Highway Ste.350
Bethesda, MD 20814
Voice: 301-657-0881 (information and referral only; Mon.-Fri., 9am-5pm EST)
Fax: 301-657-0869
Website: http://www.autism-society.org
Verified: 7/25/2012

International. Founded 1992. Organization run by and for autistic people. Provides peer support, tips for coping and problem-solving. Online listserv, advocacy, education, retreats/conferences, information and referrals.
Write:
Autism Network International
P.O. Box 35448
Syracuse, NY 13235-5448
Voice: 315-476-2462 (long-distance calls will be returned collect).
Website: http://www.autreat.com
E-mail: webmaster@autreat.com
Verified: 7/2/2012

Online. Interactive webpage providing information and support for Autism and Asperger syndrome and related disorders. 2-day free trial, $35 annual dues. Includes local, national and international support groups, research papers and descriptions. Message boards, chatrooms, research projects, links to evaluators and other Asperger syndrome online resources. Forums for families affected by Asperger syndrome and Autism and the professionals working with them.
Website: http://www.aspergersyndrome.org
E-mail: info@aspergersyndrome.org
Verified: 7/11/2012

International. 27 regional and 10 online groups. Founded 2003. Support network for adults with a diagnosis on the autism spectrum of high functioning autism, Asperger syndrome or pervasive developmental disorder. Newsletter, literature, advocacy, information and referrals. Assistance in starting local chapters.
Write:
GRASP
666 Broadway, Suite 825
New York, NY 10012
Voice: 1-888-474-7277
Website: http://www.grasp.org
E-mail: info@grasp.org
Verified: 7/26/2012

Online. Offers support to the family members of adult individuals with Asperger syndrome. Bulletin board, e-mail list and resources.
Write:
FAAAS, Inc.
PO Box 514
Centerville, MA 02632
Website: http://www.faaas.org
E-mail: faaas@faaas.org
Verified: 7/2/2012

Online. 1300 members. Founded 1997. Opportunity for families and professionals to discuss the unique aspects of supporting a person who is dually diagnosed with Down syndrome and autism, autism-spectrum disorder, or pervasive developmental disorder.
Website: http://groups.yahoo.com/group/ds-autism
E-mail: ds-autism-owner@yahoogroups.com
Verified: 7/2/2012

Online. 600 members. Founded 1999. Support for those parenting a child with autism. Deals with the day-to-day joys and challenges.
Website: http://health.groups.yahoo.com/group/parenting_autism
E-mail: arenting_autism-owner@yahoogroups.com
Verified: 7/2/2012

Online. 15,000+ members. Founded 1998. Discussion forum for parents of children on the autism spectrum who are avoiding gluten and casein and other substances in their children's diets.
Website: http://health.groups.yahoo.com/group/gfcfkids
E-mail: gfcfkids-owner@yahoogroups.com
Verified: 7/2/2012

Online. 1247+ members. Founded 2006. Provides support for parents whose children have been diagnosed or are experiencing issues such as attention deficit disorder/hyperactivity disorder, anxiety, autism spectrum disorders (including Asperger and persistent developmental delay), learning disabilities, speech and language delays, sensory integration dysfunction, reactive attachment disorder, post-traumatic stress disorder and oppositional defiant disorder.
Website: http://health.groups.yahoo.com/group/neuronetwork
E-mail: neuronetwork-owner@yahoogroups.com
Verified: 7/2/2012