| Business | Phone |
| Hilson Co 1245 Rand Rd, Des Plaines 60016 | (847) 827-7953 |
| South Side Control Supl 917 Elmhurst Rd, Des Plaines 60016 | (847) 952-0013 |
| Merkle-Korff Industries 1776 Winthrop Dr, Des Plaines 60018 | (847) 296-8800 |
| Isotec Inc 1780 E Birchwood Ave, Des Plaines 60018 | (847) 299-9299 |
| Sai Midwest Command Ctr 2116 S Wolf Rd, Des Plaines 60018 | (847) 699-0188 |
| Siemens Maintenance Svc 1011 E Touhy Ave 118, Des Plaines 60018 | (847) 759-8566 |