| Business | Phone |
| Anges Inc 9210 Corporate Blvd, Rockville 20850 | (301) 990-1660 |
| Applied Cell Sciences 9700 Great Seneca Hwy # 214, Rockville 20850 | (240) 453-6331 |
| Audience Research Analysis 7108 Horizon Ter, Rockville 20855 | (301) 987-2514 |
| Biostatistics Center 6110 Executive Blvd # 750, Rockville 20852 | (301) 881-9260 |
| Blanchette Rockfeller 9601 Medical Center Dr, Rockville 20850 | (301) 294-7180 |
| Caelum Research Corp 1700 Research Blvd, Rockville 20850 | (301) 424-8205 |
| Cangen 9700 Great Seneca Hwy # 234, Rockville 20850 | (240) 453-8496 |
| Cato Research 15020 Shady Grove Rd, Rockville 20850 | (301) 309-1260 |
| Centers For Behavioral Health 9605 Medical Center Dr, Rockville 20850 | (301) 251-4702 |
| Cooper Clinical & Reg Cons 305 Watkins Cir, Rockville 20850 | (301) 987-1081 |
| Research Court Deli 1 Research Ct, Rockville 20850 | (301) 216-0416 |
| Ori 6110 Executive Blvd # 506, Rockville 20852 | (301) 984-4735 |
| Health Research Assoc 1603 Auburn Ave, Rockville 20850 | (301) 762-7484 |
| International Epidemiology 1455 Research Blvd, Rockville 20850 | (301) 517-4060 |
| International Research 18100 Cashell Rd, Rockville 20853 | (301) 570-2284 |