List of mergers in Yamagata Prefecture

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Here is a list of mergers in Yamagata Prefecture, Japan since the Heisei era.

Mergers from April 1, 1999 to Present

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On July 1, 2005 - The towns of Amarume and Tachikawa (both from Higashitagawa District) were merged to create the town of Shōnai.
On October 1, 2005 - The old city of Tsuruoka absorbed the towns of Fujishima, Haguro and Kushibiki, the village of Asahi (all from Higashitagawa District) and the town of Atsumi (from Nishitagawa District) to create the new and expanded city of Tsuruoka. Nishitagawa District was dissolved as a result of this merger. (Merger Information Page)
On November 1, 2005 - The old city of Sakata absorbed the towns of Hirata, Matsuyama and Yawata (all from Akumi District) to create the new and expanded city of Sakata. (Merger Information Page)

Planned/Future Mergers

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v t e Yamagata Prefecture
Yamagata (capital)
Core city	Yamagata
Cities	Higashine Kaminoyama Murayama Nagai Nan'yō Obanazawa Sagae Sakata Shinjō Tendō Tsuruoka Yonezawa
Districts	Akumi District Yuza Higashimurayama District Nakayama Yamanobe Higashiokitama District Kawanishi Takahata Higashitagawa District Mikawa Shōnai Kitamurayama District Ōishida Mogami District Funagata Kaneyama Mamurogawa Mogami Ōkura Sakegawa Tozawa Nishimurayama District Asahi Kahoku Nishikawa Ōe Nishiokitama District Iide Oguni Shirataka
List of mergers in Yamagata Prefecture