Father's Rights Investigations
- Specializes in custodial disputes, background checks (criminal and civil), and consultation.
- http://www.frinvestigations.com

Pacey Investigations
- Specializing in legal, insurance, surveillance, infidelity and workmans compensation investigations.
- http://www.paceyinvestigations.com/

Washington Association of Legal Investigators
- Washington State based legal investigator association. Site has information about their organization, membership information, and links to other sites that may be of interest.
- http://www.wali.org/

The Pacific Northwest Association of Investigators
- A Washington State based association for Private Investigators. Their web site features licensing information, press releases, and history of their organization.
- http://www.pnai.com/

Confidential Detective Agency
- Seattle based agency specializing in background checks, employee screening, theft, surveillance, vehicle tracking, and infidelity. Describes qualifications and experience.
- http://www.thedetectives.net

Corporate Security Services, Inc.
- Specializes in corporate security issues. Also offers investigative services.
- http://www.corpsecure.com/

DunRite Investigations
- Full service investigation firm located in the Puget Sound area.
- http://www.dunriteinvestigations.com/

Nichols & Associates
- Providing services in Washington State including Seattle, Tacoma and Spokane.
- http://www.nicholsinvestigations.com/

Powers Investigations
- Services include locating and finding people, surveillance, and background checks. Also a price guide, and resource links.
- http://www.powersinvestigations.com

Shadowman Investigation Agency
- Services include employment screening, skip traces, process serving, video and surveillance.
- http://www.shadowmanpi.com/

Sitka Investigative Services, Inc.
- Professional investigative services firm providing a full range of investigative and protective services.
- http://www.sitkainvestigations.com

Peterson Investigations
- Offer a range of investigative services in Vancouver, Washington, including corporate investigations, undercover assignments, fraud investigations, surveillance, and process serving.
- http://www.petersonpi.com/

Linda Montgomery Investigations
- Private investigation agency for civil and criminal work in Seattle.
- http://www.lmipi.com/