| Name | Phone | Category |
| Safeway, Inc. | 925-467-3000 | Grocers & Markets |
| San Mateo Credit Union | 650-363-1789 | Banks & Credit Unions |
| Sand Hill Global Advisors | 650-854-9150 | Financial Services |
| Santa Clara Valley Water District | 408-265-2600 | Chamber Builder |
| The Scharff Law Group, Inc. | 650-325-7200 | Attorneys |
| Schaub's Meat, Fish & Poultry | 650-325-6328 | Grocers & Markets |
| Schiller Construction Inc | 650-940-1982 | Building |
| School of Rock Palo Alto | 650-388-9964 | Music |
| Scott's Seafood | 650-323-1555 | Restaurants, Cafes & Catering |
| Justin Self - Automatic Data Processing | 408-679-7149 | Business to Business Resources |
| Sereno Group | 650-323-1900 | Real Estate |
| ServeSurfer Foundation | 650-814-2701 | Community & Government |
| Sharon Green Apartments | 650-854-3900 | Real Estate |
| Sharper Technology, Inc. | 650-964-4600 | Computers and Electronics |
| Sheraton Palo Alto Hotel | 650-328-2800 | |
| Shuman Snyder LLP. | 650-443-5100 | Attorneys |
| Siam Orchid PA, LLC | 650-325-1994 | Restaurants, Cafes & Catering |
| Sigona's Farmers Market | 650-329-1340 | Grocers & Markets |
| Silicon Valley (San Jose) Business Journal | 408-299-1816 | Leaders Circle |
| Silicon Valley Association of Realtors | 408-200-0100 | Real Estate |
| Silicon Valley Bank | 654-5599 | Chamber Builder |
| Silicon Valley Pad | 650-276-0536 | Business to Business Resources |
| SkinSpirit | 650-324-9600 | Spas |
| Smith Venture Group | 650-327-7323 | Financial Services |
| Smythe & Cross | 650-383-5426 | Shopping & Retail |
| Sofia University | 650-493-4430 | Non-Profit |
| The Solar Planet | 650-331-0658 | Shopping & Retail |
| Sonoma Teriyaki | 707-448-2551 | Restaurants, Cafes & Catering |
| Soquel Vineyards | 831- 462-9045 | Wineries |
| Space Systems/Loral | 650-852-4988 | Chamber Builder |
| Spot - A Pizza Place | 650 324-3131 | Restaurants, Cafes & Catering |
| Sprinkles Cupcakes | 650-323-9300 | Bakery |
| Stanford Alumni Association | 650-723-2021 | Associations, Clubs & Organizations |
| Stanford Blood Center | 650-723-7831 | Hospitals & Clinics |
| Stanford Electric Works | 650-323-4139 | Building |
| Stanford Federal Credit Union | 650-723-2509 | Chamber Builder |
| Stanford Financial Company Realtors | 650-321-2200 | Real Estate |
| Stanford Floral Design | 650-462-8230 | Florists |
| Stanford Flying Club | 650-858-2200 | Aircraft Flight Training |
| Stanford Hospital & Clinics | 650-724-2462 | Leaders Circle |
| Stanford Lively Arts | 650-725-ARTS(2787) | Entertainment and Arts |
| Stanford Shopping Center | 650-617-8200 | |
| Stanford University | 650-725-3329 | Leaders Circle |
| Stanford University Athletic Department | 650-723-1021 | Education |
| Star One Credit Union | 408-543-5202 | Banks & Credit Unions |
| Steve TenBroeck, Broker, Alain Pinel Realtors | 650-450-0160 | Real Estate |
| Stevenson House | 650-494-1944 | Non-Profit |
| Stoecker & Northway Architects, Inc. | 650-965-3500 | Architects |
| Strutz LeVett Investment Co. | 650-321-0440 | Real Estate |
| Sullivan & Cromwell LLP | 650-461-5677 | Attorneys |
| Sundance The Steakhouse | 650-321-6798 | Restaurants, Cafes & Catering |
