| Business | Phone |
| Arrowhead Investigations 10790 Civic Center Dr, Rancho Cucamonga 91730 | (909) 944-9302 |
| Brown's Investigative Network 9388 Foothill Blvd, Rancho Cucamonga 91730 | (909) 481-2562 |
| Gns Svc Rancho Cucamonga 91730 | (909) 948-7141 |
| Investigative Resoure Group 9495 9th St # G, Rancho Cucamonga 91730 | (909) 944-3111 |
| Employment Check Inc 9121 Haven Ave # 160, Rancho Cucamonga 91730 | (909) 987-5115 |
| Garland Investigations 7365 Carnelian St # 219, Rancho Cucamonga 91730 | (909) 483-0440 |
| Gdg Investigations 8313 Avenida Castro, Rancho Cucamonga 91730 | (909) 945-2492 |
| Priority West Investigations 7365 Carnelian St, Rancho Cucamonga 91730 | (909) 948-7021 |
| Stewart Investigative Svc 10572 Acacia St, Rancho Cucamonga 91730 | (909) 484-1500 |