| Business | Phone |
| Advantage Investigations Po Box 1262, Portland 4104 | (207) 878-5055 |
| Aegis Group 58 Fore St, Portland 4101 | (207) 772-5250 |
| All Phase Investigations Portland 4101 | (207) 774-2819 |
| Northeast Investigations Portland 4103 | (207) 797-6164 |
| Karen Serunian Investigation 295 Forest Ave # 11, Portland 4101 | (207) 773-4369 |
| Lawyers Investigating Svc 121 Middle St, Portland 4101 | (207) 775-5685 |
| Seer Investigations Portland 4101 | (207) 772-3999 |
| Serunian Investigations 211 Marginal Way # 114, Portland 4101 | (207) 773-2660 |
| Calderbank Investigations Po Box 10928, Portland 4104 | (207) 671-3868 |
| Cunningham Investigations Po Box 1693, Portland 4104 | (207) 775-5656 |