| Business | Phone |
| Advanced Custom Engineered Co 450 Gundersen Dr 200, Carol Stream 60188 | (630) 376-1056 |
| Guest Distribution 370 Kimberly Dr 430, Carol Stream 60188 | (630) 588-8607 |
| Maac Machinery 590 Tower Blvd, Carol Stream 60188 | (630) 665-1700 |
| Thyssen Krupp Specialty Steels 365 Village Dr, Carol Stream 60188 | (630) 682-3900 |