| Name | Phone | Category |
| The Tailor Maid | 650-328-8858 | Tailors |
| The Tan Group | 650-493-5500 | Real Estate |
| Tarlton Properties, Inc. | 650-330-3600 | Real Estate |
| Taylor Properties | 650-322-4433 | Real Estate |
| Telepacific Communications | 408 240-2200 | Telecommunications |
| The Wave Magazine | 408-467-3263 | Advertising & Media |
| TheatreWorks | 650-463-1950 | Theater Companies and Dinner Theaters |
| Thoits Brothers, Inc. | 650-323-4868 | Real Estate |
| Thoits, Love, Hershberger & McLean | 650-327-4200 | Attorneys |
| Thomas Fogarty Winery & Vineyard | 650-851-6777 | Wineries |
| Threestory Studio | 650-323-6800 | Marketing and Communications |
| TIBCO Software Inc. | 650-846-1000 | Computers and Electronics |
| Tiffany & Co. | 650-328-2552 | Jewelers |
| Tile Source, Inc. | 650-424-8672 | Home & Office |
| Townsend and Townsend and Crew LLP | 650-326-2400 | Attorneys |
| Transactive Networks | 408-892-0956 | Business to Business Resources |