| Business | Phone |
| Hitec Group 8160 S Madison St, Willowbrook 60527 | (630) 654-9200 |
| Sita Associates 9515 Falling Waters Dr E, Willowbrook 60527 | (630) 321-9790 |
| Tml Inc 625 Plainfield Rd 142-, Willowbrook 60527 | (630) 325-1481 |
| Timemed Labeling Systems Inc 144 Tower Dr, Willowbrook 60527 | (630) 986-1800 |
| Mylin Medical Systems Inc 11904 Heritage Dr, Willowbrook 60527 | (630) 321-1450 |