List of mergers in Tokyo

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Here is a list of mergers in Tokyo, Japan since the replacement of all feudal domains with prefectures in 1871. It also covers mergers into Tokyo.

Prefectural border changes[edit]

This list may be incomplete, some smaller changes through cross-prefectural municipal mergers/transfers of neighbourhoods/border corrections may be missing. Changes in Tokyo's coastline are not included.

District merger[edit]

Municipal mergers[edit]

This list is incomplete, most mergers are missing.

Name changes[edit]

  • 1928 – Chōfu village (Chōfu-mura) in Ebara county becomes a town and is renamed East Chōfu town (Higashi-Chōfu-machi; note: there had been a Chōfu-machi/Chōfu town in North Tama county, Kanagawa since 1889. There had also been Chōfu-mura/Chōfu village in West Tama county (Nishitama-gun), Kanagawa since 1889. North (Kita-), South (Minami-) and West Tama counties (Nishi-Tama-gun) were transferred from Kanagawa to Tokyo in 1893, so that there were three different municipalities named "Chōfu" (two -mura, one -machi) in Tokyo until 1928. Eventually, East Chōfu town, Ebara became part of Tokyo City in 1932, Chōfu village, West Tama became part of Ōme city in 1951 and Chōfu town, North Tama became part of Chōfu city in 1955)
  • 1970 – Murayama town (Murayama-machi) becomes a city and is renamed Musashi-Murayama city (Musashi-Murayama-shi; note: there was already a Murayama-shi/Murayama city in Yamagata/Dewa since 1954.)
  • 1970 – Yamato town (Yamato-machi) becomes a city and is renamed Higashi-Yamato-shi ("East Yamato city"; note: there was already a Yamato-shi/Yamato city in Kanagawa since 1959. Geographically, Higashi-Yamato-shi lies almost exactly north of Yamato-shi; the Higashi/"East" (東) represents the (東) in Tōkyō – Higashi-Yamato-shi is "Tokyo's Yamato City".[14] There had also been a Yamato town in Saitama which was renamed as Wakō city in 1970.)
  • 1970 – Kurume town (Kurume-machi) becomes a city and is renamed East Kurume city (Higashi-Kurume-shi; note: there was already a Kurume-shi/Kurume city in Fukuoka, one of the first 40 cities of Japan in 1889/90.)


  • There are several technical differences between two types of mergers: hennyū gappei, "incorporating/absorbing mergers", where one or several municipalities merge into another that continues to exist, and shinsetsu gappei, "new establishment mergers", where two or more municipalities dissolve to establish a new one which may bear the identical name of one of its predecessors. In the latter case – regardless of naming –, for example, municipal institutions (mayor and assembly) lose their mandates, and new elections must be held.
  • County/district governments were dissolved in the 1920s following a 1921 initiative by the Hara Cabinet and are not mentioned in the list after their abolition as administrative units.


  1. ^ Tokyo Metropolitan Government: History of Tokyo, p.233 (Note: The document doesn't specify how it treats dates before the introduction of the Gregorian calendar in 1873. The eleventh month of the Gregorian year 1871 is November 1871, but the eleventh month of the year Meiji 4 began in Gregorian December 1871 and ended in Gregorian January 1872.)
  2. ^ Tokyo Metropolitan Archives: Documents related to the transfer of the seven Izu Islands (in Japanese)
  3. ^ Ogasawara-mura/Ogasawara Village: History (in Japanese)
  4. ^ National Archives of Japan: The incorporation of the three Tama into Tokyo prefecture (in Japanese)
  5. ^ Nishitōkyō-shi (West Tokyo city)/Nishitokyo City, city history, Hōya section: 市のおいたち・地名の由来(保谷版)
  6. ^ Kita-ku/Kita City: Kita-kusei yōran/Kita City Guide (bilingual Japanese/English; but the chronological table is Japanese only), p. 31
  7. ^ Mizuho-machi/Mizuho Town: History
  8. ^ Iruma-shi/Iruma City: City outline (in Japanese), p. 3
  9. ^ a b c d e Hachiōji City: 都市体制編, p. 28
  10. ^ a b Tokyo Metropolitan Archives: 大東京35区物語~15区から23区へ~東京23区の歴史
  11. ^ Miyake Village: 行政概要/沿革
  12. ^ Machida City: 沿革
  13. ^ Tachikawa City: 立川市の歴史(1950年から1970年まで) Archived 2013-10-24 at
  14. ^ Higashiyamato City: 市の花、市の木、市章、市の名称>市の名称 「東大和」の名称について

External links[edit]

  • Tokubetsu-ku kyōgikai ("Conference of special wards"; an association of the 23 present-day municipalities in former Tokyo city, organized as a non-profit foundation (kōeki zaidan hōjin)): Historical maps of some towns and villages in Tokyo (in Japanese)