| Business | Phone |
| Nexus Market Research 147 Brentwood St, Portland 4103 | (207) 774-4537 |
| Pearl Information Svc 110 Park St, Portland 4101 | (207) 775-5889 |
| Portland Research Group 408 Fore St, Portland 4101 | (207) 874-2077 |
| Seaport Surveys Maine Corp 44 Oak St, Portland 4101 | (207) 756-7770 |
| Strategic Marketing Svc 5 Milk St, Portland 4101 | (207) 774-6738 |
| Critical Insights Inc 120 Exchange St # 3, Portland 4101 | (207) 772-4011 |