- Access Background Checks, Inc.
 - Woodland Hills - Includes pre-employment screening. - Accurate Credit Bureau
- Pasadena - Provides tenant credit reporting for landlords and real estate agents, as well as employment screening services for small businesses.
- 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.
- Advance Credit Services
- San Gabriel - Specialising in residential mortgage credit report and tenant screening.
- Advanced Electronic Security Company
- Los Angeles - Specialising in countermeasure security including bugsweeps and wiretap detection.
- Allstate Investigations
- Chatsworth - Specialising in fugitive recovery, surveillance, background investigations, skip tracing, employee theft, and undercover operations.
- American Detectives
- Loma Linda - International private investigation firm based in California. Services include surveillance, missing persons, and cheating spouses.
- American Labor Resources
- Wrightwood - Offering DMV, employer, education, and workers compensation history checking services.
- Ashkelon Group, The
- Los Angeles - Information technology detective agency offering services like email tracing, legal support services, forensic data recovery, counter surveillance, and more in the field of computer crime investigations.
- Avatar Investigations
- Los Angeles - Offers investigative and consulting services.
- Blue Print Investigative Services,
- Van Nuys - Investigation services and specialised consulting.
- C.J. Ford Private Investigations
- Santa Ana - Offering searches, collections, judgment recovery, accident investigation, paralegal services, and more.
- California Business Intelligence
- Camarillo - Personal and business investigations, asset locating, and competitive intelligence.
- Cavasos Investigation Service (CIS)
- Newbury Park - Offering civil, criminal, and commercial investigative services.
- Chameleon Group, The
- Canoga Park - Private investigation and security services. Does everything from asset searches, missing person locates and insurance investigations to commercial, residential, personal and event security.
- Crutchfield Investigators Inc.
- Beverly Hills - Private investigator. Site includes services, books, and background information.
- Danny Davis Investigations
- Riverside - Private investigator.
- Dataland
- Los Angeles - Provides legal, financial, and business communities with skip tracing, credit reporting, background verification, asset discovery, and people locating information.
- Discreet Data Research
- Irvine - Provider of elusive information to collection agencies, attorneys and private investigators.
- Drug Detection Dogs
- Palm Springs - Private investigaton explosives and drug detection with canines.
- Gladding & Michel, Inc.
- Costa Mesa - National and international full-service investigative agency specialising in corporate intelligence, environmental, product liability, and trial work.
- Information Resources
- Torrance - Provides background checks and pre-employment screening.
- InformationForBusiness
- Encino - Full service public records information source for skip tracing, asset searches, civil and criminal backgrounds and business filings.
- Inter-Agency Investigations
- Beverly Hills - Services include fraud, background, and financial investigations.
- Intersec
- Santa Monica - International security consultants.
- Investigative Resources International
- Long Beach - A professional investigative agency providing comprehensive service to the legal, corporate, insurance, financial and entertainment communities
- JCL Enterprises
- Long Beach - Private invesigators and insurance adjusters.
- JGI Incorporated
- Newport Beach - Offers investigative and attorney support service.
- Kale Investigation Agency
- Downey - Licensed and bonded agency specialising in lost loves, missing persons, adoptee searches and background checks.
- Magallanes Associates International (MAI)
- Los Angeles - Corporate security, investigative and training featuring multilingual former FBI Agents.
- MCM Investigations
- Newhall - Specialises in surveillance, divorce and child custody matters, and insurance fraud.
- MJM Investigations, Inc.
- Ontario - Specialising in insurance fraud investigations and surveilance.
- Morales and Associates LLC
- Ojai - Specialising in the investigation and counselling of EEO discrimination complaints primarily within the federal sector.
- National Credit and Attorney Resources
- Tarzana - Offers missing person searches, background checks, public records searches, vehicle history reports, and debt collection.
- Noesis
- Los Angeles - Investigative consultancy firm specialising in all areas of white-collar crime and corporate due diligence, with offices in San Francisco and Los Angeles.
- Roberts & Associates
- Temecula - State licensed firm for criminal, civil, and domestic investigations.
- Scott, Robert, PI
- Los Angeles - Private investigator offering background, fraud, and missing person investigations.
- Source Investigative Group
- Redondo Beach - Provides professional, confidential investigations to businesses, attorneys, and the general public.
- Source, The
- Torrance - Offering pre-employment background investigations and other services for employers.
- Specialized Investigations
- Van Nuys - Specialises in areas of insurance fraud, suspicious claims, workers' comp, AOE/COE, surveillance, information services.
- Sultan & Company
- Los Angeles - Provides corporations and law firms with private investigations, due diligence, and litigating support.
- Teller Group, The
- Winnetka - Claims management and private investigations firm.
- Tristar Investigation
- Los Angeles - Services include surveillance, locating missing persons, locating assets, service of process, witness statements, and business identification.
- Truth or Lie
- Glendora - Polygraph examination service that can perform the necessary tests right in your office.
- USA-FACT, Inc.
- Riverside - Offers online background screening for criminal, credit, and employment history, reference verification, and drug testing services.
- V.Y. Harper & Co.
- Culver City - Licensed and insured private investigation and information resource firm with over 25 years of expertise and experience.
- Venezia Investigative Services
- Corona del Mar - Former NYPD Seargent providing nationwide private investigator/detective services.
- Verdict Resources
- Camarillo - Specialises in investigative research in the environmental field.
- Western Data Research
- San Juan Capistrano - Servicing the mortgage banking industry.
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