| Business | Phone |
| Tcb Networks Security Systems 110 Candlewyck Dr, Kalamazoo 49001 | (269) 385-8180 |
| Catalyst Technologies Llc 5895 Chandra Dr, Kalamazoo 49004 | (269) 344-2475 |
| Computer Advisory Group 4000 Portage St, Kalamazoo 49001 | (269) 342-0007 |
| Micro/Lync Business Systems 68 Moffett Ave, Kalamazoo 49004 | (269) 345-5000 |