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National Association of Investigative Specialists
Membership directory, searchable by location and specialization.

Oklahoma Private Investigators Association
Offering a statewide directory of investigators.

PI Register.Com
International directory of private investigators.

DetectiveHelp.com
Searchable database of private investigators in the United States and Canada.

ExpertPages.com
Investigative service providers, organized by specialty.

ExpertLaw
Find a private investigator or related service, by specialty and location.

Nationwide PI Network
International directory of private investigators.

FindPiS.com
Directory of private investigators searchable by zip code.

Infoguys
Searchable international directory of private investigators.

Bail.com
Directory bail bondsmen, investigators, and defense attorneys, searchable by state.