| Business | Phone |
| Clarke Investigations 1405 Richcrest, Edmond 73013 | (405) 844-7300 |
| Dover Investigations Edmond 73013 | (405) 752-1435 |
| Duane Adair & Assoc 200 E 10th St, Edmond 73034 | (405) 340-7261 |
| Investigative Reports Inc Edmond 73034 | (405) 844-8700 |
| Vigilant Investigative Svc Co 10001 Buffalo Ridge Rd, Edmond 73003 | (405) 330-3817 |
| Taylor Research & Invstgtns 1616 E 19th St, Edmond 73013 | (405) 715-9904 |
| Sibel Investigation Edmond 73003 | (405) 823-0684 |