| Business | Phone |
| Viper Security Enforcement Inc 3307 E Kilgore Rd, Kalamazoo 49001 | (269) 385-4310 |
| Charles Services 620 Cherokee St, Kalamazoo 49006 | (269) 382-4800 |
| Retailer's Security Svc 819 E Stockbridge Ave, Kalamazoo 49001 | (269) 327-2002 |
| Corporate Security Solutions 151 S Rose St, Kalamazoo 49007 | (269) 344-3711 |
| Corporate Security Solutions 3030 S 9th St, Kalamazoo 49009 | (269) 375-6852 |
| Guardsmark Inc 350 E Michigan Ave 27, Kalamazoo 49007 | (269) 343-8779 |