List of mergers and dissolutions of municipalities in Japan
From Infogalactic: the planetary knowledge core
This page links to the list of mergers and dissolutions of municipalities in Japan for each prefecture.
For a list of dissolved municipalities, see also: Category:Dissolved municipalities of Japan and the sister article Category:Former districts of Japan.
Lists, by prefecture
Note that most of the prefectural websites linked below are in Japanese.
See also
A list of future mergers for every prefecture can be found here (in Japanese).
A list of former mergers for every prefecture can be found here or here (in Japanese).