| Business | Phone |
| Chatham Hill Reporting Svc 331 Tecumseh Ave, Mount Vernon 10553 | (914) 667-6361 |
| Ada Guards Inc 16 S 1st Ave, Mount Vernon 10550 | (914) 668-2470 |
| Melnic Investigations Inc 9 W Prospect Ave, Mount Vernon 10550 | (914) 699-1400 |
| Universal Investigations 11 Park Ave, Mount Vernon 10550 | (914) 699-0774 |