- Discreet Data Research
 - Irvine - Provider of elusive information to collection agencies, attorneys and private investigators. - C.J. Ford Private Investigations
- Santa Ana - Offering searches, collections, judgment recovery, accident investigation, paralegal services, and more.
- Gladding & Michel, Inc.
- Costa Mesa - National and international full-service investigative agency specialising in corporate intelligence, environmental, product liability, and trial work.
- Adolescent Guidance Services (AGS)
- Costa Mesa - Special emphasis is placed on locating and returning runaways through non-violent, crisis intervention techniques. Also offers youth transport services to schools, mental health facilities, wilderness programmes, social engagements, and judicial facilities.
- Western Data Research
- San Juan Capistrano - Servicing the mortgage banking industry.
- Venezia Investigative Services
- Corona del Mar - Former NYPD Seargent providing nationwide private investigator/detective services.
- JGI Incorporated
- Newport Beach - Offers investigative and attorney support service.
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