| Business | Phone |
| Allington International Inc 20160 Center Ridge Rd # 206, Cleveland 44116 | (440) 333-0505 |
| Angelotta Investigations 526 Superior Ave E, Cleveland 44114 | (216) 771-6780 |
| Atlantis Co 105 Ken Mar Industrial Pkwy, Cleveland 44147 | (440) 717-7050 |
| Branon Mc Cann Group 30650 Pinetree Rd # 12, Cleveland 44124 | (216) 464-1925 |
| Bureau Of Research Inc 75 Public Sq # 1210, Cleveland 44113 | (216) 589-0540 |
| C S Investigations Cleveland 44130 | (440) 243-0756 |
| Cefarati Group 4608 Saint Clair Ave, Cleveland 44103 | (216) 696-1161 |
| Citywide Security Svc 2249 Payne Ave, Cleveland 44114 | (216) 408-0004 |
| William F Florio & Assoc 10235 Brecksville Rd, Cleveland 44141 | (440) 838-4711 |
| Competitive Intelligence Inst 815 Superior Ave E # 1715, Cleveland 44114 | (216) 589-4779 |
| Confidential Solutions Inc 14701 Detroit Ave # 256, Cleveland 44107 | (216) 228-3394 |
| U S One Control Data 1422 Euclid Ave # 1024, Cleveland 44115 | (216) 781-8500 |
| Detective Service Bureau 3699 Willow Run, Cleveland 44145 | (440) 734-4780 |
| Team One Investigations 5005 Rockside Rd, Cleveland 44131 | (216) 642-8107 |
| Tenable Protective Svc 1242 E 49th St, Cleveland 44114 | (216) 361-0002 |
| Discovery Resources Inc 20525 Center Ridge Rd, Cleveland 44116 | (440) 331-4455 |
| Target Investigative Svc Inc Po Box 609481, Cleveland 44109 | (216) 351-3336 |
| Elliott Investigation Cleveland 44107 | (216) 521-1717 |
| Empire Investigations Inc 2000 E 9th St, Cleveland 44115 | (216) 348-1820 |
| F J Ippolito & Assoc 1501 Euclid Ave, Cleveland 44115 | (216) 623-3222 |
| Facticon Inc 7650 Chippewa Rd # 309, Cleveland 44141 | (440) 717-9701 |
| Security Essentials 29525 Chagrin Blvd, Cleveland 44122 | (216) 839-0700 |
| Research Control Intl Cleveland 44132 | (216) 261-2351 |
| Gracetech Agency 7803 Brookpark Rd, Cleveland 44129 | (216) 635-2776 |
| Heilman Danczak & Assoc 5425 Warner Rd, Cleveland 44125 | (216) 901-1134 |
| Professional Investigation Svc 5451 Broadview Rd, Cleveland 44134 | (216) 661-1366 |
| Pica Inc Cleveland 44115 | (216) 696-6713 |
| Inphoto Surveillance 6507 Marsol Rd, Cleveland 44124 | (440) 605-0783 |
| Insight Research Systems 21863 Aurora Rd, Cleveland 44146 | (216) 663-5011 |
| Integra Investigations 26671 Rose Rd, Cleveland 44145 | (440) 333-8720 |
| International Research Group 19111 Detroit Rd, Cleveland 44116 | (440) 333-6602 |
| Nationwide Integrity Svc 10850 Pearl Rd, Cleveland 44136 | (440) 238-3000 |
| North Coast Investigations Cleveland 44145 | (440) 899-7527 |
| Meech Security & Investigation 6551 Grant Ave # 100, Cleveland 44105 | (440) 995-8800 |