| Business | Phone |
| Avant Guarde Enterprises 9s120 Lake Dr 103, Willowbrook 60527 | (630) 455-0939 |
| Fic Inc 459 60th Pl, Willowbrook 60527 | (630) 655-9183 |
| Connectech Solutions 10s526 Glenn Dr, Willowbrook 60527 | (630) 321-1013 |
| Kbs2 Inc 455 S Frontage Rd 112, Willowbrook 60527 | (630) 850-7878 |
| Midwest Laser Specialist Inc 7550 S Quincy St, Willowbrook 60527 | (630) 654-0002 |
| Neu Computer Systems 8330 S Madison St, Willowbrook 60527 | (630) 734-8686 |
| Numina Systems Corp 60 Shore Dr, Willowbrook 60527 | (630) 323-0308 |
| Polhode Data Acquistion 6211 Cove Creek Ct, Willowbrook 60527 | (630) 323-0134 |
| Strategic Solutions Inc 16w231 S Frontage Rd 1, Willowbrook 60527 | (630) 834-5330 |
| Ultra Corp 80 Burr Ridge Pkwy Pmb 177, Willowbrook 60527 | (630) 654-8300 |
| Wyse Technology Inc 7420 S County Line Rd, Willowbrook 60527 | (630) 850-9881 |
| Magenic Technologies 200 S Frontage Rd 300, Willowbrook 60527 | (630) 371-4015 |