| Business | Phone |
| American Bureau-Investigations Po Box 984, St Peters 63376 | (636) 947-8898 |
| Usck St Peters 63376 | (636) 477-8635 |
| Tri-Star Investigations 4270 S Highway 94, St Peters 63304 | (636) 928-8641 |
| Midwest Information Brokers Po Box 1924, St Peters 63376 | (636) 939-5006 |
| Investigations Unlimited Inc 21 Imperial Cir, St Peters 63303 | (636) 441-3060 |
| Confidential Resources Group Po Box 1756, St Peters 63376 | (636) 928-0047 |