Washington Private Investigators and Investigation Agencies for Hire


Following are private investigators and investigation agencies in the state of Washington.  Before hiring a detective or agency, contact the appropriate state licensing authority to confirm current license information.

Washington Department of Licensing, Public Protection Unit
405 Black Lake Boulevard
P.O. Box 9649
Olympia, WA  98507-9649

Visit the Washington State Private Investigator Association

Hire a Private Investigator in Washington

The following list is in alphabetical order and is by no means a ranking.  We encourage you to evaluate each detective’s services and select the most appropriate provider based on your individual needs. Take the time to review their website (if available) and call several different investigators to ask questions and get price quotes. To learn more about hiring a professional PI firm near you, and get more details on the costs involved, read our article Tips for hiring a P.I.

Advanced Investigative Concepts

Owner: Marvin Wilson
[email protected]

10900 NE 4th St Suite 2300 Washington 98004 2761

  • Background investigations
  • Matrimonial Checks
  • Infidelity Checks
  • Process Service
  • Locates ( Legal)
  • Overseas offices in Asia

International Counterintelligence Services, Inc. of Washington

Owner – Michael Rabern
3400 Capitol Blvd Suite #101 Tumwater, Washington 98501
Telephone (206) 515-2000
FAX (480) 675-8800
[email protected]
Washington Private Investigator

Washington Private Investigator, celebrating 40 years in business! We have private investigators on call 24 hours a day/seven days a week available for a free consultation. You can call our local Washington phone number at (206) 515-2000 or toll free (800) 828-9198. If you are seeking an investigation we have the exact specialist for you. We are licensed, insured, bonded and have been serving clients in and outside of the state since 1967. Visit our website or call for our extensive list of investigators and credentials. International Counterintelligence Services, Inc.® (ICS™) License No. 2725

 Intercept Investigations

700 NW Gilman Blvd. # 463, Issaquah (Seattle), Washington 98027
Owner – Steven Gudin, Director
Telephone – 425-313-1776
[email protected]

Seattle Tacoma Washington Private Investigator Detective Surveillance & General Investigations, Information, Intelligence, Counter surveillance & Counterintelligence, WA License # 1661, NV License # 847

Northwest Loss Prevention Consultants

Owner -Douglas Rector
PO Box 3142, Renton, WA 98056
Telephone – (425)271-0312
FAX – 888-433-0060
[email protected]

Washington License 2672. Member of WALI, Greater Seattle Chamber of Commerce, BNI, Washington Restaurant Association. Employee investigations, criminal, pre-employment background, skip tracing, attorney services, mystery shopping services, criminal and civil investigations.

Powers Investigations

Owner – James Powers, Principal Investigator
1517 S. 27th Street, Renton (Seattle), Washington 98055
Telephone – 425-235-0989
FAX – 425-226-4267
[email protected]
Specialist in Surveillance, Domestic Infidelity, Missing Persons, Locates, Video/Digital Documentation, Process of Service, Insurance, Worker Comp, Attorney Services, and General Investigations. WA License #601825062-1686, CA License #25093.

Seattle Private Investigator – Confidential Detective Agency

P.O. Box 467 Mercer Island, Washington<
Owner – S. Chesterfield / Principal
Telephone – 206-251-2839
[email protected]
We specializes in Infidelity Investigations, Criminal Background Checks, and Armed Executive Protection services. Washington State P.I. Agency license #2214. Bonded.

Security Management and Integration

Owner – Cecil Avery
1423 East 29th St, Suite 317, Tacoma Washington 98404 USA
Telephone – 2537225832<
FAX – 2537225961
[email protected]

SMI investigations are extensive, detailed, and fully develop issues as to character and trustworthiness of the business or personnel being investigated. SMI technical surveys provide a organization a comprehensive view of how to protect it vital communication plan through analysis of phone, fax, face-to-face, computer intercepts, secure communication and facility implementation. SMI understands that technical countermeasures is more that locating eavesdropping devices, but a total ontology of espionage of a company’s vulnerabilities to sophisticated attacks that include honey traps (spies), social engineering, blackmail, and hacking and recommends approaches to protect overall security of your communication plans.

T.R.A.C.E. Investigations, LLC

Owner: William Grove
1818 W. Francis #232, Spokane, WA 99205
Email [email protected]
Phone: (509) 904-7266
Private Investigator License Number: 4450\

Description of Services:
T.R.A.C.E. Investigations is a licensed and insured private investigation firm (Agency Lic.#2315) operated out of Spokane, Wa. The firm’s primary investigator, William Grove (Armed PI Investigator Lic.#4450) is a retired Law Enforcement officer with over 35 years of investigative experience. Primary services include: Criminal Investigations, Infidelity Investigations, Witness Locates, Criminal/Civil Interviews, Court Testimony, Background Research, Process Service, Child Custody, Missing Person Locates, Surveillance and Undercover Investigative Services.

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