| Business | Phone |
| Msi Inc 525 W Fullerton Ave, Addison 60101 | (630) 628-9313 |
| Seritex 1064 W Republic Dr, Addison 60101 | (630) 628-0540 |
| Sky Line Inc 1433 W Fullerton Ave, Addison 60101 | (630) 424-0300 |
| Technology Concepts Assoc Ltd 703 W Annoreno Dr 9, Addison 60101 | (630) 628-0950 |
| Usaco 645 S Addison Rd, Addison 60101 | (630) 832-2346 |