| Business | Phone |
| American Marketing Assn 227 S Highland Ave, Baltimore 21224 | (410) 276-0027 |
| Maryland Marketing Source 817 Maiden Choice Ln # 150, Baltimore 21228 | (410) 247-1970 |
| Battelle Survey Operations 6115 Falls Rd # 200, Baltimore 21209 | (410) 377-5660 |
| Cippac 7515 Berkshire Rd, Baltimore 21224 | (410) 288-3319 |
| Freidman Marketing Svc 7846 Eastpoint Mall, Baltimore 21224 | (410) 284-7900 |
| Quick Test/Heakin 8200 Perry Hall Blvd # 1160, Baltimore 21236 | (410) 933-9400 |
| Harris Consultants 1811 Bolton St, Baltimore 21217 | (240) 361-6888 |
| Jacobs Jenner & Kent 400 E Pratt St # 800, Baltimore 21202 | (410) 752-4810 |
| Observation Baltimore 300 W Pratt St # 250, Baltimore 21201 | (410) 332-0400 |
| Pinnacle Marketing Mgmt 16 S Calvert St # 509, Baltimore 21202 | (410) 234-8031 |
| Consumer Pulse 1232 Race Rd, Baltimore 21237 | (410) 687-3400 |
| Innovative Medical Research 1001 Cromwell Bridge Rd # 302, Baltimore 21286 | (410) 825-0500 |
| Stevens Automated Marketing 1 Baltimore Ave, Baltimore 21222 | (410) 243-6060 |