| Business | Phone |
| Advanced Testing Laboratory 6954 Cornell Rd # 200, Cincinnati 45242 | (513) 489-8447 |
| Cinti Clinical Consultants 10999 Reed Hartman Hwy, Cincinnati 45242 | (513) 791-3711 |
| Clinical Research Consultants 310 Terrace Ave # 201, Cincinnati 45220 | (513) 961-8200 |
| Goodwyn Institutional Review 5090 Elmcrest Ln, Cincinnati 45242 | (513) 793-8900 |
| Hartford Research Group 10550 Montgomery Rd # 20, Cincinnati 45242 | (513) 792-5042 |
| Hightop Medical Research Center 6107 Hamilton Ave, Cincinnati 45224 | (513) 681-0606 |
| Kendle International Inc 441 Vine St # 1200, Cincinnati 45202 | (513) 381-5550 |
| New Horizon Clinical Research 10475 Reading Rd, Cincinnati 45241 | (513) 769-2767 |
| Osmic Enterprises Inc 4242 Airport Rd, Cincinnati 45226 | (513) 321-1623 |
| Radiant Research Inc 7720 Montgomery Rd, Cincinnati 45236 | (513) 984-6887 |
| Sterling Research Group 2230 Auburn Ave, Cincinnati 45219 | (513) 381-4100 |