Reference Solutions

Formerly known as referenceUSA, this database from Data Axle is updated weekly and provides information on 56 million businesses, 228 million historical records, and 1.2 million physicians and dentists in the United States. It also lists 2.5 million job and internship postings.

It is searchable by corporate or personal name, location, ticker symbol, and many other filters.  Doctors can be searched by office or personal name, location, medical school, age, gender, specialty, and more.