| Adolfo Barrera D.D.S. Pediatric Dentistry | San Jose | California | 408-920-7070 |
| Adoptive Family Therapeutic & Education Resources-AFTER | San Jose | California | 408-554-2550 |
| 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: Special Education & Regional Center Eligibility | Pleasanton | California | 510-426-5559 |
| After Autism - Listen Beyond Words | Los Gatos | California | 408-395-2277 |
| Aging and Adult Services - San Mateo Co. | San Mateo | California | 650-573-3900 |
| Alba Alamillo - Hypnotherapist | Palo Alto | California | 408-439-8155 |
| All Ears Audio Books | San Jose | California | 408-370-7003 |
| All Ages Special Ed Home Tutoring | Palo Alto | California | 650-325-3234 |
| All Care Plus | Palo Alto | California | 650-424-0204 |
| All Hands In | Fremont | California | 510-703-2777 |
| Alliance Counseling Center | San Jose | California | 408-293-4489 |
| Almaden Institute for Individual and Family Growth | San Jose | California | 408-266-7826 |
| Almaden Valley Christian School | Morgan Hill | California | 408-776-6691 |
| Almaden Valley Counseling Service | San Jose | California | 408-997-0200 |
| Alpha Vista Allied Health Clinic | Sunnyvale | California | 408-826-8262 |
| Alternating Hemiplegia of Childhood Foundation | Redwood City | California | 888-225-3353 |
| Altitude: Partnering with Families | Los Gatos | California | 408-353-0377 |
| Alum Rock Counseling Center | San Jose | California | 408-294-0500 |