| Business | Phone |
| Winston Services 3550 W Main St # 201, Norman 73072 | (405) 364-9898 |
| United Security Norman 73069 | (405) 364-2527 |
| Private Investigations 330 W Gray St, Norman 73069 | (405) 579-7800 |
| R & M Investigations Inc 2317 Westwood Dr, Norman 73069 | (405) 360-3234 |
| P D Investigations 123 E Tonhawa St, Norman 73069 | (405) 573-0600 |
| Lighthouse Investigations 105 1/2 E Main St, Norman 73069 | (405) 329-9990 |