Bail.com
Directory bail bondsmen, investigators, and defense attorneys, searchable by state.
DetectiveHelp.com
Searchable database of private investigators in the United States and Canada.
ExpertLaw
Find a private investigator or related service, by specialty and location.
ExpertPages.com
Investigative service providers, organized by specialty.
National Association of Fraud Investigators
Database of investigators focusing on Fraud Investigation.
National Association of Investigative Specialists
Membership directory, searchable by location and specialization.
Nationwide PI Network
International directory of private investigators.
Oklahoma Private Investigators Association
Offering a statewide directory of investigators.
PI Resources and Locator
Directory of private investigators with industry resources.
Pimall.com
Directory of private investigators with resources for this profession.