Clarkson Investigative Service Criminal, civil investigations, technical accident investigation and witness interviewing.

Confidential Detective Agency Seattle based agency specializing in background checks, employee screening, theft, surveillance, vehicle tracking, and infidelity. Describes qualifications and experience.

Corporate Security Services, Inc. Specializes in corporate security issues. Also offers investigative services.

Crash Investigators Spokane based Private investigator that specializes in investigating automotive accidents. Site has information about services offered and contact information.

Discovery Investigation and Paralegal Services Private Investigatigation and litigation support for the cities of Vancouver, Washington and Portland, Oregon. Paralegal services also offered.

DunRite Investigations Full service investigation firm located in the Puget Sound area.

Father's Rights Investigations Specializes in custodial disputes, background checks (criminal and civil), and consultation.

Joslin Investigations Investigative services for criminal and civil matters in Seattle.

Kathleen Kennedy Investigations Seattle based private investigator that conducts criminal, civil and general investigations.

Linda Montgomery Investigations Private investigation agency for civil and criminal work in Seattle.

Lock & Load Investigative Services, LLC Full range of private investigation services in and around the Puget Sound area.

Nichols & Associates Providing services in Washington State including Seattle, Tacoma and Spokane.

Pacey Investigations Specializing in legal, insurance, surveillance, infidelity and workmans compensation investigations.

Peterson Investigations Offer a range of investigative services in Vancouver, Washington, including corporate investigations, undercover assignments, fraud investigations, surveillance, and process serving.

Powers Investigations Services include locating and finding people, surveillance, and background checks. Also a price guide, and resource links.

Shadowman Investigation Agency Services include employment screening, skip traces, process serving, video and surveillance.

Sitka Investigative Services, Inc. Professional investigative services firm providing a full range of investigative and protective services.

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.

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.