| Business | Phone |
| Integrated Audio Design 312 Sheridan Dr 1b, Willowbrook 60527 | (630) 321-1596 |
| Medlin Communications 16w235 83rd St C, Willowbrook 60527 | (630) 734-7300 |
| Midwest Tech Svc Inc 7101 S Adams St 8, Willowbrook 60527 | (630) 325-8383 |
| Procom Sound Systems 251 S Frontage Rd 27, Willowbrook 60527 | (630) 323-2699 |
| Radio Shack 6944 Kingery Hwy, Willowbrook 60527 | (630) 323-7522 |
| Rje Telecom 136 Shore Dr, Willowbrook 60527 | (630) 321-0101 |
| Satcom Systems Inc 8330 S Madison St 70, Willowbrook 60527 | (630) 325-4444 |
| Sound & Vision Willowbrook 530 Executive Dr, Willowbrook 60527 | (630) 455-0751 |
| Tmo Comms 231 S Frontage Rd, Willowbrook 60527 | (630) 323-0150 |
| Wandel & Goltermann Inc 621 Plainfield Rd, Willowbrook 60527 | (630) 655-9242 |
| National Voice & Data 104 Burr Ridge Pkwy, Willowbrook 60527 | (630) 920-9950 |