AMA Physician Select: - Provides information on member physicians in the United States.
DocFinder: - A health professional licensing database provided by the Association of State Medical Board Executive Directors and Administrators in Medicine. USA.
Doctordirectory.com: - Searchable database including specialties, office hours, and contact information. USA.
Iknowdoctors.com: - Offers a search function to locate a doctor by specialty or geographic area. USA.