| Business | Phone |
| Alpha Group Investigation 100 Broadhollow Rd # 200, Farmingdale 11735 | (631) 454-1100 |
| Cola Investigation Co Inc 335 Main St # B, Farmingdale 11735 | (516) 249-5343 |
| Comp-U-Pro 34 Merokee Pl, Farmingdale 11735 | (516) 249-4006 |
| Confidential Investigative Svc 395 Fulton St, Farmingdale 11735 | (516) 752-1409 |
| Jtb Investigation Svc Inc 769 Fulton St, Farmingdale 11735 | (516) 753-6666 |
| Top Flight Investigations 7150 Republic Airport # 101, Farmingdale 11735 | (516) 731-3333 |