| Name | Phone | Category |
| Aaron David Productions | 650-691-3100 | Entertainment and Arts |
| Abilities United | 650-494-0550 | Community & Human Services |
| AchieveKids | 650-494-1200 | Health Services |
| Ada's Cafe and Catering | 650-269-5505 | Non-Profit |
| Addison Antique, LLC | 650-328-1540 | Furniture & Accessories |
| AJ's Green Cleaners | 650-494-1550 | Cleaning Services |
| All About Parking, Inc. | 650-242-4005 | Event Planning & Management |
| All Care Plus, Inc. | 650-424-0204 | Health Services |
| All Saints' Episcopal Church and Community Center | 650-322-4528 | Churches |
| Allied Arts Guild | 650-322-2405 | Event Planning & Management |
| Allstate Insurance | 650-322-5191 | Insurance Services |
| Alta Mesa Cemetery & Funeral Home | 650-493-1041 | Cemeteries |
| Ambiance Interiors, Inc. | 650-494-0161 | Furniture & Accessories |
| American Cancer Society, Santa Clara County Unit | 408-688-0104 | Health Services |
| American Red Cross,Silicon Valley Chapter | 408-577-2113 | Community & Human Services |
| American Self Storage | 650-325-8609 | Moving & Storage |
| Ami Laws, MD., Inc. | 650-325-3200 | Physicians |
| Amour Vert, INC. | 650-847-1707 | Shopping & Retail |
| Art Young Insurance Agency | 650-838-1080 | Insurance Services |
| AT&T | 650-473-8022 | Telecommunications |
| Avenidas | 650-289-5400 | Community & Human Services |
| Avid Bank | 650-843-2265 | Banks & Credit Unions |
