| Business | Phone |
| Accident Analysis & Consulting Po Box 991082, Redding 96099 | (530) 246-2773 |
| Art Wooden Private Po Box 720056, Redding 96099 | (530) 241-1480 |
| Ashmun Investigations Po Box 991676, Redding 96099 | (530) 247-7288 |
| D F Leary & Assoc 999 Mission De Oro Dr, Redding 96003 | (530) 223-6984 |
| Gale Jackson Investigations Redding 96001 | (530) 241-0792 |
| Harvey Lacy Investigations 1957 Pine St, Redding 96001 | (530) 246-1400 |
| Kelley Investigative Agency 1726 Tehama St, Redding 96001 | (530) 241-9635 |
| Middleton Investigative Svc 923 Dana Dr # 15, Redding 96003 | (530) 221-4303 |
| North Valley Investigations 2521 Hilltop Dr # 129, Redding 96002 | (530) 722-0222 |
| Northstar Legal Svc 1348 Market St # 206, Redding 96001 | (530) 243-2600 |
| Pre-Employ Com 3655 Meadow View Dr, Redding 96002 | (530) 378-7680 |
| Seminoff Investigations Redding 96002 | (530) 221-5614 |
| Todd Lofgren Private Invstgtr Redding 96001 | (530) 246-0105 |
| West Coast Investigative Svc 1574 West St, Redding 96001 | (530) 247-1373 |