| Business | Phone |
| Dennis Detective Agency Inc 515 Benfield Rd, Severna Park 21146 | (301) 261-1241 |
| Donaldson Investigations Ltd Severna Park 21146 | (410) 544-7147 |
| Males Investigative Svc Inc Severna Park 21146 | (410) 384-9335 |
| Maxwell Private Investigations 302 Ritchie Hwy # 104, Severna Park 21146 | (410) 647-0544 |