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Mergent Online, Orbis, and ReferenceUSA will help identify large International and U.S. competitors, both public and private. It will also help identify whether a competitors is public, private, or a subsidiary.
ReferenceUSA is particularly useful for small business research. The Book of Lists focuses on top businesses in 40 metro areas, including Denver.
A directory of about 44 million U.S. private and public companies. Provides addresses, contact names, estimates sales and employee figures. Users can search by SIC, yellow page heading, state, city, and down to the zip code level.