| Business | Phone |
| Bonham Research 2316 Wineberry Ter, Baltimore 21209 | (410) 601-0111 |
| Morse Associates 4 W University Pkwy, Baltimore 21218 | (410) 243-6033 |
| Chesapeake Group Inc 3610 Milford Mill Rd # T2, Baltimore 21244 | (410) 265-1784 |
| Urban Information Assoc 20 Bouton Green Ct, Baltimore 21210 | (410) 464-6368 |