| ADHD-Tennis | Palo Alto | California | |
| Adolescent Counseling Services | Palo Alto | California | 650-424-0852 |
| Adolescent Residential Center | San Jose | California | 408-254-6848 |
| Adolfo Barrera D.D.S. Pediatric Dentistry | San Jose | California | 408-920-7070 |
| Adopt A Special Kid (AASK) | Oakland | California | 510-553-1748 x 12 |
| Adoptive Family Therapeutic & Education Resources-AFTER | San Jose | California | 408-573-8222 |
| Adrienne's Daycare | San Jose | California | 408-266-4927 |
| Adult / Older Adult Division - Santa Clara County Mental Health Department | San Jose | California | 800-704-0900 |
| Advancing Minds | San Jose | California | 408-294-9903 |
| Advocacy Center | Rochester | New York | 800-650-4967 |
| Advocacy: Special Education & Regional Center Eligibility | Pleasanton | California | 510-426-5559 |
| Advocate 4 U | Ramona | California | 760-415-4872 |
| Advocate's Legal Clinic, a Private Law Firm | Deltona | Florida | 386-574-3044 |
| Advocates for Children of New York, Inc. | New York | New York | 212-947-9779 |
| Advocates for Justice and Education CPRC | Washington | District Of Columbia | 202-265-1432 |
| Aero Mobility | Santa Ana | California | 877-325-4000 |
| AFB National Employment Center - San Francisco | San Francisco | California | 415-392-4845 |
| After Autism - Listen Beyond Words | Los Gatos | California | 408-395-2277 |
| Aging and Adult Services - San Mateo Co. | San Mateo | California | 650-573-3900 |
| AGRE - Autism Genetic Resource Exchange | Los Angeles | California | 866-612-2473 |