- Aaron Investigations & Research, Inc.
 - Chandler - Asset and background investigations, missing persons, insurance fraud, business intelligence, and executive protection services. - Arizona Private Investigator
- Phoenix - Serving Phoenix, Scottsdale, Mesa, Tempe, and Chandler. Specialising in surveillance, infidelity, and locates.
- azdsi: Arizona Drug Screening & Investigations
- Phoenix - Specialises in pre-employment background screening.
- Computrace Detective Agency
- Humboldt - Services include location of missing persons.
- Danny Davis Investigations
- Riverside - Private investigator.
- Drug Detection Dogs
- Palm Springs - Private investigation service in Palm Springs, California, that uses drug-detecting dogs to detect illegal substances for the corporate community, concerned parents, and other PIs.
- International Counterintelligence Services, Inc. (ICS)
- Scottsdale - Provides government, business, and private clients rapid response consultations for investigations or security consulting.
- ION Incorporated
- Mesa - Worldwide private investigator referral service.
- J.T. Zuzga & Associates
- Scottsdale - Missing persons and witness locates, background inquiries, surveillance, audio/video documentation and more.
- Palmer Investigative Services
- Prescott - Offering records searches, process serving, drug and alcohol testing, alcohol expert testimony, and mitigation in capital cases.
- RC Investigations
- Phoenix - Offers services in areas of bodily injury, divorce, insurance, and record searches.
- Roberts & Associates
- Temecula - State licensed firm for criminal, civil, and domestic investigations.
- USA-FACT, Inc.
- Riverside - Offers online background screening for criminal, credit, and employment history, reference verification, and drug testing services.
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