| Business | Phone |
| Woelfel & Assoc 2011 Mall St D, Collinsville 62234 | (618) 345-3411 |
| River Bend Investigations 820 Bond Ave, Collinsville 62234 | (618) 346-4904 |
| Pyr Tech 843 Saint Louis Rd, Collinsville 62234 | (618) 344-1621 |
| Professional Investigators 101 Saint Louis Rd, Collinsville 62234 | (618) 344-5544 |