| Business | Phone |
| Cunningham Field Svc 9301 Tampa Ave # 1698, Northridge 91324 | (818) 718-1034 |
| L A Research Inc 9010 Reseda Blvd # 109, Northridge 91324 | (818) 993-5500 |
| Nfo Plog Research Inc 9221 Corbin Ave # 220, Northridge 91324 | (818) 998-2345 |
| West Coast Marketing Research 19205 Parthenia St # E, Northridge 91324 | (818) 709-1610 |
| Silny Rosenberg 8038 Lasaine Ave, Northridge 91325 | (818) 637-6440 |