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A district of Japan is dissolved when all towns or villages in the district become cities or are merged into the city. The following is a list of dissolved districts of Japan. The date shown is the day the district was dissolved (i.e. the district was active until that date) and the reason why the district was dissolved is also shown.

Before Edo period

1868 to 1895

Tōhoku
Kantō
Chūbu
Kansai
Shikoku
Kyushu
Others

1896

February 26, 1896
March 26, 1896
March 29, 1896
April 1, 1896
April 18, 1896

1897~1912

1912~1926

  • April 4, 1913 Kaitō (海東郡) and Kaisai (海西郡), Aichi (Merged to form Ama District)
  • February 1, 1918 Muroran District (室蘭郡), Hokkaido (The town of Muroran and the villages of Wanishi, Chimaibetsu, and Motomuroran merged to form the borough (-ku) of Muroran (now the city of Muroran))
  • April 1923 Furebetsu District (振別郡), Hokkaido (The village of Furebetsu (振別村) merged with other villages to form the village of Rubetsu in Etorofu)
  • April 1, 1925 Higashinari District (東成郡), Osaka (Merged into the city of Osaka)
  • April 1, 1925 Nishinari District (西成郡), Osaka (Merged into the city of Osaka)

1927~1945

  • April 1, 1931 Kii District (紀伊郡), Kyoto (The villages of Kamitoba, Kisshōin, Fukakusa, Shimotoba, Yokoōji, Nōso, Horiuchi, Mukaijima, and Takeda merged into the city of Kyoto)
  • October 1, 1932 Ebara District (荏原郡), Tokyo (Merged into the city of Tokyo)
  • October 1, 1932 Toyotama District (豊多摩郡), Tokyo (Merged into the city of Tokyo)
  • October 1, 1932 Kitatoshima District (北豊島郡), Tokyo (Merged into the city of Tokyo)
  • October 1, 1932 Minamiadachi District (南足立郡), Tokyo (Merged into the city of Tokyo)
  • October 1, 1932 Minamikatsushika District (南葛飾郡), Tokyo (Merged into the city of Tokyo)
  • October 1, 1936 Kuraki District (久良岐郡), Kanagawa (The town of Kanazawa and the village of Mutsuurashō merged into the city of Yokohama)
  • October 1, 1938 Tachibana District (橘樹郡), Kanagawa (The villages of Mukaigaoka, Miyasaki, the town of Inada, and the village of Ikuta merged into the city of Kawasaki)
  • April 1, 1939 Tsuzuki District (都筑郡), Kanagawa (The village of Nitta, the town of Kawara, and the villages of Yamauchi, Nakasato, Nakagawa, Tana, Niiharu, Tsuoka, and Futamatagawa merged into the city of Yokohama; the villages of Kakioeki and Okagami merged into the city of Kawasaki)
  • September 1, 1940 Otaru District (小樽郡), Hokkaido (The village of Asari merged into the city of Otaru)
  • September 1, 1940 Takashima District (高島郡), Hokkaido (The town of Takashima merged into the city of Otaru)

1945~1959

1960~1988

  • October 1, 1962 Ashikaga District (足利郡), Tochigi (The towns of Mikuriya and Sakanishi merged into the city of Ashikaga)
  • April 1, 1963 Inaba District (稲葉郡), Gifu (The towns of Sohara, Naka, Inaha, and Unuma merged to form the city of Kakamigahara)
  • May 1, 1965 Asaka District (安積郡), Fukushima (The towns of Asaka, Hiwada, Fukuyama, Atami, and the villages of Mihota, Ouse, Katahira, Kikuta, and Konan merged into the city of Kōriyama)
  • October 1, 1966 Iwaki District (石城郡), Fukushima (The towns of Yotsukura, Ogawa, Tōno, the villages of Kawamae, Miwa, Yoshima, Tabito, 2 towns and villages from Futaba District, and the cities of Taira, Jōban, Iwaki, Nakoso, and Uchigō merged to form the city of Iwaki)
  • January 1, 1967 Chiba District (千葉郡), Chiba (The town of Yachiyo gained city status to become the city of Yachiyo)
  • April 1, 1967 Kasai District (加西郡), Hyōgo (The towns of Hōjō, Kasai, and Izumi merged to form the city of Kasai)
  • October 1, 1967 Ichihara District (市原郡), Chiba (The town of Nansō and the village of Kamo merged into the city of Ichihara)
  • May 1, 1968 Nishichikuma District (西筑摩郡), Nagano (Renamed to Kiso District (木曽郡))
  • October 1, 1968 Shinobu District (信夫郡), Fukushima (The town of Azuma merged into the city of Fukushima)
  • January 1, 1969 Abe District (安倍郡), Shizuoka (The villages of Ōkōchi, Umegashima, Tamakawa, Ikawa, Kiyosawa, and Ōkawa merged into the city of Shizuoka)
  • April 1, 1969 Suki (周吉郡), Ōchi District (穏地郡), Ama (海士郡), and Chibu (知夫郡) Districts, Shimane (Merged to form Oki District)
  • August 1, 1970 Yoribetsu District (幌別郡), Hokkaido (The town of Noboribetsu gained city status to become the city of Noboribetsu)
  • November 1, 1970 Chitose District (千歳郡), Hokkaido (The town of Eniwa gained city status to become the city of Eniwa)
  • November 3, 1970 Kitatama District (北多摩郡), Tokyo (The town of Murayama gained city status to become the city of Musashimurayama)
  • December 1, 1970 Higashikasugai District (東春日井郡), Aichi (The town of Asahi gained city status to become the city of Owariasahi)
  • December 1, 1970 Hekikai District (碧海郡), Aichi (The town of Takahama gained town status to become the city of Takahama, the town of Chiryū gained city status to become the city of Chiryū)
  • May 1, 1971 Jōdō District (上道郡), Okayama (The town of Jōdō merged into the city of Okayama)
  • November 1, 1971 Minamitama District (南多摩郡), Tokyo (The town of Tama gained city status to become the city of Tama and the town of Inagi gained city status to become the city of Inagi)
  • November 3, 1971 Kitakawachi District (北河内郡), Osaka (The town of Katano gained city status to become the city of Katano)
  • April 1, 1972 Soo District (囎唹郡), Kagoshima (renamed to Soo District (曽於郡))
  • March 20, 1973 Asa District (安佐郡), Hiroshima (The towns of Yasufuruichi, Satō, and Kōyō merged into the city of Hiroshima)
  • March 1, 1975 Sawara District (早良郡), Fukuoka (The town of Sawara merged into the city of Fukuoka)
  • February 1, 1979 Innan District (印南郡), Hyōgo (The town of Shikata merged into the city of Kakogawa)
  • March 1, 1988 Natori District (名取郡), Miyagi (The town of Akiu merged into the city of Sendai)

1989~1998

1999~2004

  • April 1, 1999 Taki District (多紀郡), Hyōgo (The towns of Sasayama, Nishiki, Tannan, and Konda merged to form the city of Sasayama)
  • October 1, 2001 Kurita District (栗太郡), Shiga (The town of Rittō gained city status to become the city of Rittō)
  • February 3, 2003 Ashina District (芦品郡), Hiroshima (The town of Shinichi merged into the city of Fukuyama)
  • April 1, 2003 Yamagata District (山県郡), Gifu (The town of Takatomi, the village of Ijira, and the town of Miyama merged to become the city of Yamagata)
  • April 1, 2003 Ōkawa District (大川郡), Kagawa (The towns of Hiketa, Shirotori, and Ōchi merged to form the city of Higashikagawa)
  • April 21, 2003 Tsuno District (都濃郡), Yamaguchi (The town of Kano merged with the cities of Tokuyama, Shinnanyō, and the town of Kumage from Kumage District to form the city of Shūnan)
  • March 1, 2004 Sado District (佐渡郡), Niigata (the towns of Aikawa, Kanai, Sawata, Hatano, Mano, Hamochi and Ogi; and the villages of Niibo, and Akadomari merged with the city of Ryōtsu to form the city of Sado)
  • March 1, 2004 Gujō District (郡上郡), Gifu (The towns of Hachiman, Yamato, Shirotori, and the villages of Takasu, Minami, Meihō, and Wara merged to form the city of Gujō)
  • March 1, 2004 Mashita District (益田郡), Gifu (The towns of Hagiwara, Osaka, Gero, Kanayama, and the village of Maze merged to form the city of Gero)
  • March 1, 2004 Takata District (高田郡), Hiroshima (The towns of Yoshida, Yachiyo, Midori, Takamiya, Kōda, and Mukaihara merged to form the city of Akitakata)
  • March 1, 2004 Iki District (壱岐郡), Nagasaki (The towns of Gōnoura, Katsumoto, Ashibe, and Ishida merged to form the city of Iki)
  • March 1, 2004 Shimoagata District (下県郡), Nagasaki (The towns of Izuhara, Mitsushima, and Toyotama merged with three towns from Kamiagata District to form the city of Tsushima)
  • March 1, 2004 Kamiagata District (上県郡), Nagasaki (The towns of Mine, Kamiagata, and Kamitsushima merged with three towns from Shimoagata District to form the city of Tsushima)
  • April 1, 2004 Naka District (中郡), Kyoto (The towns of Mineyama and Ōmiya and other 2 districts 4 towns merged to form the city of Kyōtango)
  • April 1, 2004 Takeno District (竹野郡), Kyoto (The towns of Amino, Takeno, Yasaka and the other 2 districts 3 towns merged to form the city of Kyōtango)
  • April 1, 2004 Kumano District (熊野郡), Kyoto (The town of Kumihama and the other 2 districts 5 towns merged to form the city of Kyōtango)
  • April 1, 2004 Yabu District (養父郡), Hyōgo (The towns of Yōka, Yabu, Ōya, and Sekinomiya merged to form the city of Yabu)
  • April 1, 2004 Futami District (双三郡), Hiroshima (The towns of Kisa, Mirasaka, Miwa, and the villages of Sakugi, Kimita, and Funo merged with the city of Miyoshi and the town of Kōnu from Kōnu District to form the city of Miyoshi)
  • April 1, 2004 Uma District (宇摩郡), Ehime (The town of Doi, the village of Shingū, and the cities of Iyomishima and Kawanoe merged to form the city of Shikokuchūō)
  • April 1, 2004 Higashiuwa District (東宇和郡), Ehime (The towns of Akehama, Uwa, Nomura, Shirokawa, and Mikame from Nishiuwa District merged to form the city of Seiyo)
  • October 1, 2004 Shima District (志摩郡), Mie (The towns of Hamajima, Daiō, Ago, Shima, and Isobe merged to form the city of Shima)
  • October 1, 2004 Yasu District (野洲郡), Shiga (The towns of Chūzu and Yasu merged to form the city of Yasu)
  • October 1, 2004 Kōka District (甲賀郡), Shiga (The towns of Ishibe and Kosei merged to form the city of Konan; The towns of Minakuchi, Tsuchiyama, Kōka, Kōnan, and Shigaraki merged to form the city of Kōka)
  • October 1, 2004 Nogi District (能義郡), Shimane (The towns of Hirose and Hakuta merged with the city of Yasugi to form the city of Yasugi)
  • October 1, 2004 Kawakami District (川上郡), Okayama (The town of Nariwa, Kawakami, and Bitchū merged with the city of Takahashi and the town of Ukan from Jōbō District to form the city of Takahashi)
  • October 1, 2004 Oe District (麻植郡), Tokushima (The towns of Kamoshima, Kawashima, Yamakawa, and the village of Misato merged to form the city of Yoshinogawa)
  • November 1, 2004 Kitaaizu District (北会津郡), Fukushima (The village of Kitaaizu merged into the city of Aizuwakamatsu)
  • November 1, 2004 Taga District (多賀郡), Ibaraki (The town of Jūō merged into the city of Hitachi)
  • November 1, 2004 Higashitonami District (東礪波郡), Toyama (The town of Shogawa and the city of Tonami merged to form the city of Tonami; the town of Jōhana, the villages of Taira, Kamitaira, Toga, the town of Inami, the village of Inokuchi, and the town of Fukuno merged with the town of Fukumitsu from Nishitonami District to form the city of Nanto)
  • November 1, 2004 Ayama District (阿山郡), Mie (The town of Iga, the village of Shimagahara, the town of Ayama, and the village of Ōyamada merged with the city of Ueno and the town of Aoyama in Naga District to form the city of Iga)
  • November 1, 2004 Naga District (名賀郡), Mie (The town of Aoyama and the city of Ueno and 4 towns and villages from Ayama District merged to form the city of Iga)
  • November 1, 2004 Hikami District (氷上郡), Hyōgo (The towns of Kaibara, Hikami, Aogaki, Kasuga, Sannan, and Ichijima merged to form the city of Tamba)
  • November 1, 2004 Ketaka District (気高郡), Tottori (The towns of Ketaka, Shikano, and Aoya merged into the city of Tottori)
  • November 1, 2004 Mino District (美濃郡), Shimane (The towns of Mito and Hikimi merged into the city of Masuda)
  • November 1, 2004 Ohara District (大原郡), Shimane (The towns of Daitō, Kamo, and Kisuki merged with three towns from Iishi District to form the city of Unnan)
  • November 1, 2004 Oku District (邑久郡), Okayama (The towns of Ushimado, Oku, and Osafune merged to form the city of Setouchi)
  • November 1, 2004 Shūsō District (周桑郡), Ehime (The towns of Komatsu and Tanbara and the cities of Saijō and Tōyo merged to form the city of Saijō)

2005

January 1, 2005
January 11, 2005
  • Kawabe District (河辺郡), Akita (The towns of Kawabe and merged into the city of Akita)
  • Suzuka District (鈴鹿郡), Mie (The town of Seki and the city of Kameyama merged to form the city of Kameyama)
  • Mihara District (三原郡), Hyōgo (The towns of Midori, Seidan, Mihara, and Nandan merged to form the city of Minamiawaji)
  • Uto District (宇土郡), Kumamoto (The towns of Misumi and Shiranuhi merged with three towns from Shimomashiki District to form the city of Uki)
February 1, 2005
February 7, 2005
  • Mugi District (武儀郡), Gifu (The towns of Mugi, Mugegawa, and the villages of Horado, Kaminoho, and Itadori merged into the city of Seki)
February 13, 2005
  • Ena District (恵那郡), Gifu (The town of Sakashita, the villages of Kawaue, Kashimo, the towns of Tsukechi, Fukuoka, and the village of Hirukawa merged into the city of Nakatsugawa)
  • Toyoura District (豊浦郡), Yamaguchi (The towns of Kikukawa, Toyota, Toyoura, and Hōhoku merged with the city of Shimonoseki to form the city of Shimonoseki)
February 28, 2005
  • Aso District (安蘇郡), Tochigi (The towns Kuzu and Tanuma merged with the city of Sano to form the city of Sano)
March 1, 2005
  • Fugeshi (鳳至郡) and Suzu (珠洲郡) Districts, Ishikawa (Merged to form Hōsu District)
  • Shitsuki District (後月郡), Okayama (The town of Yoshii merged into the city of Ibara)
  • Ogi District (小城郡), Saga (The towns of Ogi, Ashikari, Ushizu, and Mikatsuki merged to form the city of Ogi)
  • Kitatakaki District (北高来郡), Nagasaki (The towns of Iimori, Konagai, Takaki, and Moriyama merged with the town of Tarami from Nishisonogi District and the city of Isahaya to form the city of Isahaya)
  • Shimoge District (下毛郡), Ōita (The towns of Honyabakei, Yabakei, Yamakuni, and the village of Sankō merged into the city of Nakatsu)
March 3, 2005
  • Minamiamabe District (南海部郡), Ōita (The towns of Ume, Kamae, Kamiura, Tsurumi, Yayoi, and the villages of Naokawa, Honjo, and Yonoutsu merged with the city of Saiki to form the city of Saiki)
March 19, 2005
March 20, 2005
  • Ukiha District (浮羽郡), Fukuoka (The towns of Ukiha and Yoshii merged to form the city of Ukiha)
March 22, 2005
  • Kojima District (児島郡), Okayama (The town of Nadasaki merged into the city of Okayama)
  • Kamo District (賀茂郡), Hiroshima (The town of Yamato merged with the town of Hongo from Toyota District, the town of Kui from Mitsugi District, and the city of Mihara to form the city of Mihara)
  • Asa District (厚狭郡), Yamaguchi (The town of San'yō merged with the city of Onoda to form the city of San'yō-Onoda)
  • Ōtsu District (大津郡), Yamaguchi (The towns of Heki, Yuya, and Misumi merged with the city of Nagato to form the city of Nagato)
  • Hita District (日田郡), Ōita (The villages of Maetsue, Nakatsue, Kamitsue, and the towns of Ōyama and Amagase merged into the city of Hita)
March 28, 2005
March 31, 2005
  • Atetsu District (阿哲郡), Okayama (The towns of Ōsa, Shingō, Tetta, and Tessei merged with the city of Niimi to form the city of Niimi)
  • Jōbō District (上房郡), Okayama (The town of Hokubō merged with 8 towns and villages from Maniwa District to form the city of Maniwa)
  • Kōnu District (甲奴郡), Hiroshima (The town of Sōryō merged with 5 towns from Hiba District and the city of Shōbara to form the city of Shōbara)
  • Hiba District (比婆郡), Hiroshima (The towns of Saijō, Tōjō, Kuchiwa, Takano and Hiwa merged with the town of Sōryō from Kōnu District and the city of Shōbara to form the city of Shōbara)
  • Usa District (宇佐郡), Ōita (The towns of Innai and Ajimu merged with the city of Usa to form the city of Usa)
  • Ōno District (大野郡), Ōita (The town of Mie, The village of Kiyokawa, the towns of Ogata, Asaji, Ōno, the village of Chitose, and the town of Inukai merged to form the city of Bungo-ōno)
April 1, 2005
  • Kurihara District (栗原郡), Miyagi (The towns of Ichihasama, Uguisuzawa, Kannari, Kurikoma, Shiwahime, Semine, Takashimizu, Tsukidate, Wakayanagi, and the village of Hanayama merged to form the city of Kurihara)
  • Tome District (登米郡), Miyagi (The towns of Ishikoshi, Towa, Toyosato, Toyoma, Nakada, Hasama, Minamikata, and Yoneyama merged with the town of Tsuyama from Motoyoshi District to form the city of Tome)
  • Monou District (桃生郡), Miyagi (The towns of Yamoto and Naruse merged to form the city of Higashimatsushima; the towns of Kahoku, Ogatsu, Kanan, Monou, and Kitakami merged with the town of Oshika from Oshika District and the city of Ishinomaki to form the city of Ishinomaki)
  • Koshi District (古志郡), Niigata (The village of Yamakoshi merged into the city of Nagaoka)
  • Higashikubiki District (東頸城郡), Niigata (The towns of Matsudai and Matsunoyama merged with the city of Tōkamachi and 2 towns and villages from Nakauonuma District to form the city of Tōkamachi)
  • Nakakubiki District (中頸城郡), Niigata (The town of Myōkōkōgen and the village of Myōkō merged into the city of Arai to become the city of Myōkō)
  • Kaminiikawa District (上新川郡), Toyama (The towns of Ōsawano and Ōyama merged with 4 towns and villages from Nei District and the city of Toyama to form the city of Toyama)
  • Nei District (婦負郡), Toyama (The towns of Yatsuo, Fuchu, and the villages of Yamada and Hosoiri merged with two towns from Kaminiikawa District and the city of Toyama to form the city of Toyama)
  • Ogasa District (小笠郡), Shizuoka (The towns of Ōsuga and Daitō merged with the city of Kakegawa to form the city of Kakegawa)
  • Haguri District (葉栗郡), Aichi (The town of Kisogawa merged into the city of Ichinomiya)
  • Nakashima District (中島郡), Aichi (The towns of Sofue and Heiwa merged into the city of Inazawa)
  • Higashikamo District (東加茂郡), Aichi (The town of Asuke, the village of Shimoyama, and the towns of Asahi and Inabu merged into the city of Toyota)
  • Asago District (朝来郡), Hyōgo (The towns of Ikuno, Wadayama, Santo, and Asago merged to form the city of Asago)
  • Kinosaki District (城崎郡), Hyōgo (The towns of Kinosaki, Takeno, and Hidaka merged with 2 towns from Izushi District and the city of Toyooka to form the city of Toyooka; the town of Kasumi merged with the towns of Muraoka and Mikata from Mikata District to form the town of Kami in Mikata District)
  • Izushi District (出石郡), Hyōgo (The towns of Izushi and Tantō merged with 3 towns from Kinosaki District and the city of Toyooka to form the city of Toyooka)
  • Soekami District (添上郡), Nara (The village of Tsukigase merged into the city of Nara)
  • Awa District (阿波郡), Tokushima (The towns of Awa and Ichiba merged with 2 towns from Itano District to form the city of Awa)
  • Naoiri District (直入郡), Ōita (The towns of Ogi, Kujū, and Naoiri merged with the city of Taketa to form the city of Taketa)
July 1, 2005
  • Kaijo District (海上郡), Chiba (The towns of Iioka and Unakami merged with the town of Hikata from Katori District and the city of Asahi to form the city of Asahi)
  • Inasa District (引佐郡), Shizuoka (The towns of Inasa, Hosoe, and Mikkabi merged into the city of Hamamatsu)
  • Iwata District (磐田郡), Shizuoka (The towns of Sakuma, Misakubo, and the village of Tatsuyama merged into the city of Hamamatsu)
August 1, 2005
September 2, 2005
October 1, 2005
  • Atsuta District (厚田郡), Hokkaido (The village of Atsuta merged into the city of Ishikari)
  • Hamamasu District (浜益郡), Hokkaido (The village of Hamamasu merged into the city of Ishikari)
  • Hiraka District (平鹿郡), Akita (The towns of Masuda, Hiraka, Omonogawa, Ōmori, Jumonji, and the villages of Sannai and Taiyū merged with the city of Yokote to form the city of Yokote)
  • Yuri District (由利郡), Akita (The towns of Nikaho, Konoura, and Kisakata merged to form the city of Nikaho)
  • Nishitagawa District (西田川郡), Yamagata (The town of Atsumi merged with 4 towns and villages from Higashitagawa District and the city of Tsuruoka to form the city of Tsuruoka)
  • Makabe District (真壁郡), Ibaraki (The town of Makabe and the village of Yamato merged with the town of Iwase from Nishiibaraki District to form the city of Sakuragawa)
  • Enuma District (江沼郡), Ishikawa (The town of Yamanaka merged with the city of Kaga to form the city of Kaga)
  • Minamiazumi District (南安曇郡), Nagano (The towns of Toyoshina and Hotaka, and the villages of Misato and Horigane merged with the towns of Akashina from Higashichikuma District to form the city of Azumino)
  • Minamishitara District (南設楽郡), Aichi (The town of Horai and Tsukude merged with the city of Shinshiro to form the city of Shinshiro)
  • Atsumi District (渥美郡), Aichi (The town of Atsumi merged into the city of Tahara)
  • Sakata District (坂田郡), Shiga (The town of Ōmi merged into the city of Maibara)
  • Naka District (那賀郡), Shimane (The towns of Kanagi, Asahi, the village of Yasaka, and the town of Misumi merged with the city of Hamada to form the city of Hamada)
  • Nima District (邇摩郡), Shimane (The towns of Yunotsu and Nima merged with the city of Ōda to form the city of Ōda)
  • Saba District (佐波郡), Yamaguchi (The town of Tokuji merged with three towns from Yoshiki District and the city of Yamaguchi to form the city of Yamaguchi)
  • Yoshiki District (吉敷郡), Yamaguchi (The towns of Aio, Ogori, and Ajisu merged with the town of Tokuji from Saba District and the city of Yamaguchi to form the city of Yamaguchi)
  • Nishikunisaki District (西国東郡), Ōita (The village of Ōta merged with the town of Yamaga from Hayami District and the city of Kitsuki to form the city of Kitsuki)
  • Ōita District (大分郡), Ōita (The towns of Yufuin, Shōnai, and Hasama merged to form the city of Yufu)
October 11, 2005
  • Kashima District (鹿島郡), Ibaraki (The village of Asahi, the town of Hokota, and the village of Taiyō merged to form the city of Hokota)
October 24, 2005
November 1, 2005
  • Higashiyamanashi District (東山梨郡), Yamanashi (The town of Katsunuma and the village of Yamato merged with the city of Enzan to form the city of Kōshū)
  • Imizu District (射水郡), Toyama (The towns of Kosugi, Daimon, Ōshima, and the village of Shimo merged with the city of Shinminato to form the city of Imizu)
  • Nishitonami District (西礪波郡), Toyama (The town of Fukuoka merged with the city of Takaoka to form the city of Takaoka)
November 3, 2005
November 7, 2005
  • Ōno District (大野郡), Fukui (The village of Izumi merged into the city of Ōno)
  • Hioki District (日置郡), Kagoshima (The town of Kinpō merged with the city of Kaseda and three towns from Kawanabe District to form the city of Minamisatsuma)

2006~

January 1, 2006
  • Hienuki District (稗貫郡), Iwate (The towns of Ōhasama and Ishidoriya merged with the town of Tōwa from Waga District and the city of Hanamaki to form the city of Hanamaki)
  • Nakakanbara District (中蒲原郡), Niigata (The town of Muramatsu merged with the city of Gosen to form the city of Gosen)
  • Age District (安芸郡), Mie (The towns of Kawage, Geinō, Anō, and the village of Misato merged with the 4 towns and villages from Ichishi District and the cities of Hisai and Tsu to form the city of Tsu)
  • Ichishi District (一志郡), Mie (The towns of Ichishi, Karasu, Hakusan, and the village of Misugi merged with 4 towns and village from Age District and the cities of Hisai and Tsu to form the city of Tsu)
  • Kanzaki District (神崎郡), Shiga (The town of Notogawa merged into the city of Higashiōmi)
  • Amata District (天田郡), Kyoto (The towns of Miwa and Yakuno merged into the city of Fukuchiyama)
  • Kasa District (加佐郡), Kyoto (The town of Ōe merged into the city of Fukuchiyama)
  • Kitakuwada District (北桑田郡), Kyoto (The town of Miyama merged with 3 towns from Funai District to form the city of Nantan)
  • Mitoyo District (三豊郡), Kagawa (The towns of Takase, Yamamoto, Mino, Toyonaka, Takuma, Nio, and Saita merged to form the city of Mitoyo)
January 23, 2006
February 1, 2006
February 11, 2006
  • Tsuna District (津名郡), Hyōgo (The town of Goshiki merged with the city of Sumoto to form the city of Sumoto)
March 1, 2006
  • Fukayasu District (深安郡), Hiroshima (The town of Kannabe merged into the city of Fukuyama)
  • Kami District (香美郡), Kōchi (The towns of Tosayamada and Kahoku and the village of Monobe merged to form the city of Kami; the towns of Akaoka, Kagami, Noichi, and Yasu and the village of Yoshikawa merged to form the city of Kōnan)
March 3, 2006
  • Onyū District (遠敷郡), Fukui (The village of Natasho merged with the town of Ōi from Ōi District to form the town of Ōi in Ōi District)
March 15, 2006
March 18, 2006
  • Usui District (碓氷郡), Gunma (The town of Matsuida merged with the city of Annaka to form the city of Annaka)
March 19, 2006
  • Nishiibaraki District (西茨城郡), Ibaraki (The towns of Tomobe and Iwama merged with the city of Kasama to form the city of Kasama)
March 20, 2006
  • Sakai District (坂井郡), Fukui (The towns of Sakai, Mikuni, Maruoka, and Harue merged to form the city of Sakai)
  • Shiga District (滋賀郡), Shiga (The town of Shiga merged into the city of Ōtsu)
  • Katō District (加東郡), Hyōgo (The towns of Yashiro, Takino, and Tōjō merged to form the city of Katō)
March 27, 2006
  • Niihari District (新治郡), Ibaraki (The village of Tamari merged with the towns of Ogawa and Minori from Higashiibaraki District to form the city of Omitama)
  • Tsukuba District (筑波郡), Ibaraki (The town of Ina and the village of Yawara merged to form the city of Tsukubamirai)
  • Nitta District (新田郡), Gunma (The town of Kasakake merged with the town of Omama from Yamada District and the village of Azuma from Seta District to form the city of Midori)
  • Yamada District (山田郡), Gunma (The town of Omama merged with the town of Kasakake from Nitta District and the village of Azuma from Seta District to form the city of Midori)
  • Sōsa District (匝瑳郡), Chiba (The town of Hikari merged with the town of Yokoshiba from Sanbu District to form the town of Yokoshibahikari in Sanbu District)
  • Shisō District (宍粟郡), Hyōgo (The town of Yasutomi merged into the city of Himeji)
  • Shikama District (飾磨郡), Hyōgo (The towns of Ieshima and Yumesaki merged into the city of Himeji)
March 31, 2006
  • Shizunai (静内郡) and Mitsuishi (三石郡) Districts, Hokkaido (Merged to form Hidaka District (日高郡))
  • Shida District (志田郡), Miyagi (The towns of Sanbongi, Matsuyama, and Kashimadai merged with two towns from Tamatsukuri District, the town of Tajiri from Tōda District, and the city of Furukawa to form the city of Ōsaki)
  • Tamatsukuri District (玉造郡), Miyagi (The towns of Iwadeyama and Naruko merged with three towns from Shida District, the town of Tajiri from Tōda District, and the city of Furukawa to form the city of Ōsaki)
  • Minamitakaki District (南高来郡), Nagasaki (The towns of Kazusa, Kuchinotsu, Minamiarima, Kitaarima, Nishiarie, Arie, Futsu, and Fukae merged to form the city of Minamishimabara)
April 1, 2006
  • Naga District (那賀郡), Wakayama (The town of Iwade gained city status to become the city of Iwade)
August 1, 2006
October 1, 2006
January 22, 2007
January 29, 2007
  • Yamato District (山門郡), Fukuoka (The towns of Setaka and Yamakawa merged with the town of Takata from Miike District to form the city of Miyama)
  • Miike District (三池郡), Fukuoka (The town of Takata merged with the towns of Yamakawa and Setaka from Yamato District to form the city of Miyama)
March 11, 2007
October 1, 2007
  • Saga District (佐賀郡), Saga (The towns of Kawasoe, Kubota, and Higashiyoga merged into the city of Saga)
December 1, 2007
  • Kawanabe District (川辺郡), Kagoshima (The towns of Kawanabe and Chiran merged with the town of Ei from Ibusuki District to form the city of Minamikyūshū)
  • Ibusuki District (揖宿郡), Kagoshima (The town of Ei merged with the towns of Kawanabe and Chiran from Kawanabe District to form the city of Minamikyūshū)
March 21, 2008
  • Mine District (美祢郡), Yamaguchi (The towns of Mitō and Shūhō merged with the city of Mine to form the city of Mine)
November 1, 2008
  • Ihara District (庵原郡), Shizuoka (The town of Yui merged into the city of Shizuoka, the town of Fujikawa merged into the city of Fuji)
  • Isa District (伊佐郡), Kagoshima (The town of Hishikari merged with the city of Ōkuchi to form the city of Isa)
January 1, 2009
March 30, 2009
May 5, 2009
January 1, 2010
January 4, 2010
February 1, 2010
March 23, 2010
March 31, 2010
April 1, 2011
August 1, 2011
September 26, 2011
October 1, 2011
November 11, 2011
October 1, 2018

See also

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