| Name | Phone | Category |
| A Simple Theory, Inc. | 650 644-8166 | Marketing and Communications |
| AAA - Northern California Nevada & Utah | 650-321-0470 | Insurance Services |
| Abilities United (Formerly C.A.R. - Community Association For Rehabilitation) | 650-494-0550 | Community & Human Services |
| Access Land Development Services, Inc. | 650-325-9681 | Real Estate |
| Achievekids | 650-494-1200 | Health Services |
| Addison Antique, LLC | 650-328-1540 | Furniture & Accessories |
| Adecco Employment Services | 650-324-2771 | Staffing Services |
| Adolescent Counseling Services | 650-424-0852 | Community & Human Services |
| ADP Small Business Service | 408-829-3968 | Accounting & Bookkeeping Services |
| Alain Pinel Realtors | 650-323-1111 | Real Estate |
| Alhouse King Keller Williams Realty | 650-354-1100 | Real Estate |
| All Bay Limousine | 650-323-7878 | Transportation Services |
| All Saints' Episcopal Church and Community Center | 650-322-4528 | Churches |
| Allied Arts Guild | 650-322-2405 | Entertainment and Arts |
| Allstate Insurance | 650-322-5191 | Insurance Services |
| Alta Mesa Memorial Park | 650-493-1041 | Cemeteries |
| Altaire Townhomes | 650 966-8881 | Real Estate |
| Ambiance Interiors, Inc. | 650-494-0161 | Furniture & Accessories |
| American Cancer Society, Santa Clara County Unit | 408-688-0108 | Health Services |
| American Express Travel Services | 650-327-3711 | Travel Services |
| American Red Cross,Silicon Valley Chapter | 650-688-0426 | Community & Human Services |
| American Self Storage | 650-325-8609 | Moving & Storage |
| Ami Laws, MD., Inc. | 650-325-3200 | Physicians |
| Andronico's Market | 510-559-2817 | Grocers & Markets |
| Anne Cribbs & Company | 650-856-3200 | Marketing and Communications |
| Arends Construction & Design, Inc. | 650-321-3113 | Building |
| Art for Well Beings | 650 776-8297 | Art Galleries |
| Assemblymember Ira Ruskin | 650-691-2121 | Community & Government |
| A-Team Home Care | 650-616-4095 | Health Services |
| Atherton Plastic Surgery Center | 650-363-0300 | Health Services |
| ATS Advanced Trustee Strategies | 650-776-2368 | Financial Services |
| Avanoo, Inc. | 310-699-9003 | |
| Avenidas | 650-289-5400 | Community & Human Services |
| Axia Electronic Payment Services | 877-875-6114 | Business to Business Resources |
