| Business | Phone |
| Geologic Data Systems 1821 Blake St # 1a, Denver 80202 | (303) 837-1699 |
| Harris Image Links Inc 1746 Colorado Blvd, Denver 80220 | (303) 215-1700 |
| J D Nelson Mapping Svc 53 S Hudson St, Denver 80246 | (303) 333-1060 |
| Thompson Mapping Systems Inc 1141 18th St, Denver 80202 | (303) 291-3350 |
| Spectrum Mapping 1560 Broadway, Denver 80202 | (303) 298-9847 |
| Magnasoft Spatial Svc Inc 2696 S Colorado Blvd, Denver 80222 | (303) 300-4840 |