| Business | Phone |
| Denver Research Ctr Inc 3950 Lewiston St # 310, Aurora 80011 | (303) 371-2776 |
| Information Research Inc 10650 E Bethany Dr, Aurora 80014 | (303) 751-0190 |
| Marle Research 14082 E Caley Ave, Aurora 80016 | (303) 750-6000 |
| Starry Canyon Research Po Box 470638, Aurora 80047 | (303) 369-2082 |
| Tmr Inc 14201 E 4th Ave, Aurora 80011 | (720) 859-8700 |