Classified Directories

Classified Directories - There are over 5,000 separate directories of classified listings (yellow pages and blue pages) covering over 14,500,000 listings for some 10,000,000 unduplicated companies, institutions, and offices of professionals. Most such directories are published once a year by the 1,600 or so telephone companies in the United States. 

Updated compilations of classified data are the major source of lists providing complete listed coverage of over 10,000,000 separate business-oriented classifications.

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Source: Postcom, 18 February 2010 12:00:00, http://postcom.org/public/admail_image/glossary.htm