| Business | Phone |
| Coleman Investigation Inc 5529 Webb St, Detroit 48204 | (313) 934-4172 |
| Council Detective & Security 20041 Hoover St, Detroit 48205 | (313) 372-9008 |
| Hunt Street Law Ctr 2200 Hunt St, Detroit 48207 | (313) 393-1010 |
| Quick Investigations Inc 10046 Conner St, Detroit 48213 | (313) 371-0100 |
| Knight Consulting Svc 19411 W Mcnichols Rd, Detroit 48219 | (313) 541-2701 |
| Napier's Detective Agency 19814 Telegraph Rd, Detroit 48219 | (313) 917-0299 |
| Mack Investigative Svc 18691 Shaftsbury Ave, Detroit 48219 | (248) 305-0961 |
| Theo Private Investigators 20314 Grand River Ave 2, Detroit 48219 | (313) 533-0084 |
| Blue Shies Unlimited 1150 Griswold St 2900, Detroit 48226 | (313) 963-8963 |
| Hilton Investigative Svc 613 Abbott St 315, Detroit 48226 | (313) 965-6322 |
| Iverson Agency 220 Bagley St, Detroit 48226 | (313) 961-2599 |
| Les Thrash Detective Agency 220 Bagley St, Detroit 48226 | (313) 963-5665 |
| Smith Investigation Agency Detroit 48227 | (313) 835-8662 |
| Total Investigations Po Box 28016, Detroit 48228 | (313) 273-3248 |
| Holland's Security & Invstgtns 19201 Forrer St, Detroit 48235 | (313) 836-1271 |
| Williams Investigation Llc Detroit 48238 | (313) 869-8128 |