| Business | Phone |
| Alagram & Assoc 21102 Woodglen Ct, Walnut 91789 | (909) 595-1050 |
| Avegon Inc 1140 Centre Dr, Walnut 91789 | (909) 468-9890 |
| Bright Computers Walnut 91789 | (909) 595-7973 |
| Computer Systems Unlimited Walnut 91789 | (909) 594-0604 |
| Efeng Global Trade Inc 671 Brea Canyon Rd, Walnut 91789 | (909) 598-6377 |
| Hyper Systems Inc 1313 N Grand Ave, Walnut 91789 | (909) 598-2277 |
| Infonet Systems 20284 Carrey Rd, Walnut 91789 | (909) 444-1147 |