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Bail.com
http://www.bail.com/
Directory bail bondsmen, investigators, and defense attorneys, searchable by state.
DetectiveHelp.com
http://www.detectivehelp.com/
Searchable database of private investigators in the United States and Canada.
ExpertLaw
http://www.expertlaw.com/investigators/
Find a private investigator or related service, by specialty and location.
ExpertPages.com
http://www.expertpages.com/investigate.htm
Investigative service providers, organized by specialty.
FindPiS.com
http://www.findpis.com/
Directory of private investigators searchable by zip code.
Infoguys
http://www.Infoguys.com/
Searchable international directory of private investigators.
National Association of Fraud Investigators
http://www.nafraud.com/
Database of investigators focusing on Fraud Investigation.
National Association of Investigative Specialists
http://www.pimall.com/nais/dir.menu.html
Membership directory, searchable by location and specialization.
Nationwide PI Network
http://www.privateinvestigators.com/
International directory of private investigators.
Oklahoma Private Investigators Association
http://www.opia.com/
Offering a statewide directory of investigators.
PI Register.Com
http://www.thepiregister.com/
International directory of private investigators.
PI Resources and Locator
http://www.piresourcesandlocator.com/findapi.html
Directory of private investigators with industry resources.
Pimall.com
http://www.pimall.com/locate/
Directory of private investigators with resources for this profession.
Private Eye List
http://www.privateEyeList.com
A searchable directory of U.S. Private Investigators.