| Business | Phone |
| Columbia Focus 3300 North Ridge Rd # 280, Ellicott City 21043 | (410) 480-9700 |
| Dataview Research Inc Ellicott City 21042 | (410) 750-9914 |
| Mirador Research Ellicott City 21043 | (410) 313-8848 |
| Newton-Evans Research Co 10176 Baltimore National Pike, Ellicott City 21042 | (410) 465-7316 |