| Business | Phone |
| A M Investigations Inc Ontario 91761 | (909) 923-6515 |
| Boggs Investigation Svc 3350 Shelby St # 200, Ontario 91764 | (909) 949-4740 |
| De Rocili & Assoc 2425 S Parco Ave, Ontario 91761 | (909) 947-1180 |
| Jcpi & Assoc 1030 N Mountain Ave, Ontario 91762 | (909) 395-0700 |
| New Centurion Investigations 307 N Euclid Ave, Ontario 91762 | (909) 988-3446 |
| South West Detective Agency 3045 S Archibald Ave # H-217, Ontario 91761 | (909) 930-2973 |