| Business | Phone |
| Vanderweele Investigations 1580 Barney Rd, Kalamazoo 49004 | (269) 342-6764 |
| Richards Investigative Svc 8404 E H Ave, Kalamazoo 49048 | (269) 341-4051 |
| Proclaim America Inc 4078 Winding Way, Kalamazoo 49004 | (269) 226-8713 |
| Hobson Pi & Security 6391 Ormada Dr, Kalamazoo 49048 | (269) 342-0553 |