| Business | Phone |
| Mpower Communications Corp 100 Pringle Ave # 530, Walnut Creek 94596 | (925) 988-8605 |
| 3 D Communications 2600 Jones Rd # 40, Walnut Creek 94597 | (925) 934-8215 |
| Front Porch Communications 1990 N California Blvd, Walnut Creek 94596 | (925) 974-0955 |
| Gbase Communications 150 N Wiget Ln, Walnut Creek 94598 | (925) 287-4440 |
| Mpower Communications Corp 2185 N California Blvd, Walnut Creek 94596 | (925) 988-8605 |
| Nf Communications 1700 N Broadway, Walnut Creek 94596 | (925) 935-9251 |
| Telelase Communication Inc 1475 N Broadway, Walnut Creek 94596 | (925) 265-4040 |
| Tetra Tech Communications 1255 Treat Blvd, Walnut Creek 94597 | (925) 947-2668 |