| Business | Phone |
| X O Communications Inc 12667 Alcosta Blvd # 350, San Ramon 94583 | (925) 405-4000 |
| Airnex Communications Inc 3000 Executive Pkwy, San Ramon 94583 | (925) 327-0400 |
| Contra Costa Tri Valley 2000 Crow Canyon Pl, San Ramon 94583 | (925) 543-0005 |
| Contra Costa Tri Valley 2440 Camino Ramon, San Ramon 94583 | (925) 866-4100 |