Factbook

A Dynamic Compendium of Interesting Japanese Literary and Publishing Facts
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Vast majority of Japanese publishing houses located in Tokyo

[UPDATED: 6-23-2017]
There are approximately 3,700 publishing companies in Japan, of which 80 percent are based in Tokyo. The majority: 60 percent employ less than 10 people. The largest 500 publishers account for more than 90 percent of book sales.
Vast majority of Japanese publishing houses located in Tokyo Posted by Richard Nathan