| Business | Phone |
| Westat 1650 Research Blvd, Rockville 20850 | (301) 251-1500 |
| Centrac 15200 Shady Grove Rd # 350, Rockville 20850 | (301) 840-3850 |
| Riva Market Research Inc 1700 Rockville Pike # 260, Rockville 20852 | (301) 652-3632 |
| Eureka Facts 17 W Jefferson St # 5, Rockville 20850 | (301) 610-0590 |
| House Market Research Inc 2301 Research Blvd # 310, Rockville 20850 | (301) 948-8800 |
| Hughes Research Corp 4 Research Pl # 140, Rockville 20850 | (301) 670-0005 |