| Business | Phone |
| Mc D Investigations 9 Ledgewood Ln, Worcester 1609 | (508) 752-5896 |
| Insight Investigations Worcester 1608 | (508) 770-1033 |
| Assure Investigations 200 Highland St, Worcester 1609 | (508) 797-9050 |
| Trace Investigation Svc Worcester 1609 | (508) 754-3840 |
| Guardian Detective Bureau 86 Pleasant St, Worcester 1609 | (508) 757-2274 |
| Alb Enterprises 70 James St, Worcester 1603 | (508) 795-7007 |