National Association of Investigative Specialists - Membership directory, searchable by location and specialization. ExpertPages.com - Investigative service providers, organized by specialty. ExpertLaw - Find a private investigator or related service, by specialty and location. Pimall.com - Directory of private investigators with resources for this profession. PIengine.com - International directory of investigators, organized geographically. Search4aPI - Directory of UK investigators categorized by county. National Network of Private Investigators - A directory of private investigators in the United States searchable by ZIP Code, city and/or state. Professional Private Investigator Directory - Directory of private investigators from the United States, Canada, United Kingdom, Australia, and New Zealand. Detectives UK - Directory of detectives and investigation agencies organised by region.