Before Edo period
*Unknown Suruga District (駿河郡), Suruga, Tokaido (Renamed to Suntō District) *Unknown Kudara District (百済郡), Settsu, (Merged into either Higashinari and Sumiyoshi Districts) *Unknown Nuttari District (沼垂郡), Echigo, Hokurikudo (Merged into Kanbara District) *Unknown Tajihi District (百済郡), Kawachi, (Split into Tanboku, Tannan and Yakami Districts) *Sengoku Era Hinai District (比内郡), Mutsu, Tozando (Merged into1868 to 1895
;Tōhoku *1878 Kita District (北郡), Mutsu (Split into Kamikita and Shimokita Districts in1896
;February 26, 1896 * Nakatsu District (仲津郡),1897~1912
*April 1, 1897 Minamisōma District (南相馬郡), Chiba (Merged into Higashikatsushika District) *April 1, 1897 Shimohabu District (下埴生郡), Chiba (Merged into Inba District, Chiba, Inba District) *April 1, 1897 Hei District, Chiba, Hei (平郡), Asai District, Chiba, Asai (朝夷郡), and Nagasa District, Chiba, Nagasa (長狭郡) Districts, Chiba (Merged into Awa District, Chiba, Awa District) *April 1, 1897 Mōda District, Chiba, Mōda (望陀郡), Sue District, Chiba, Sue (周淮郡), and Amaha District, Chiba, Amaha (天羽郡) Districts, Chiba (Merged to form Kimitsu District, Chiba, Kimitsu District) *April 1, 1897 Yamabe District, Chiba, Yamabe (山辺郡) and Musha District, Chiba, Musha (武射郡) Districts, Chiba (Merged to form Sanbu District, Chiba, Sanbu District) *April 1, 1897 Nagara District, Chiba, Nagara (長柄郡) and Kamihabu District, Chiba, Kamihabu (上埴生郡) Districts, Chiba (Merged to form Chōsei District, Chiba, Chōsei District) *April 1, 1897 Nishiazai District, Shiga, Nishiazai District (西浅井郡), Shiga (Merged into Ika District, Shiga, Ika District) *October 1, 1898 Fukatsu District, Hiroshima, Fukatsu (深津郡) and Yasuna District, Hiroshima, Yasuna (安那郡) Districts, Hiroshima Prefecture, Hiroshima (Merged to form Fukayasu District, Hiroshima, Fukayasu District) *October 1, 1898 Ashida District, Hiroshima, Ashida (芦田郡) and Honji District, Hiroshima, Honji (品治郡) Districts, Hiroshima (Merged to form Ashina District, Hiroshima, Ashina District) *October 1, 1898 Miyoshi District, Hiroshima, Miyoshi (三次郡) and Mitani District, Hiroshima, Mitani (三谿郡) Districts, Hiroshima (Merged to form Futami District, Hiroshima, Futami District) *October 1, 1898 Nuka District, Hiroshima, Nuka (奴可郡), Mikami District, Hiroshima, Mikami (三上郡), and Eso District, Hiroshima, Eso (恵蘇郡) Districts, Hiroshima (Merged to form Hiba District, Hiroshima, Hiba District) *October 1, 1898 Numata District, Hiroshima, Numata (沼田郡) and Takamiya District, Hiroshima, Takamiya (高宮郡) Districts, Hiroshima (Merged to form Asa District, Hiroshima, Asa District) *March 16, 1899 Ōuchi District, Kagawa, Ōuchi (大内郡) and Sangawa District, Kagawa, Sangawa (寒川郡) Districts, Kagawa Prefecture, Kagawa (Merged to form Ōkawa District, Kagawa, Ōkawa District) *March 16, 1899 Miki District, Kagawa, Miki (三木郡) and Yamada District, Kagawa, Yamada (山田郡) Districts, Kagawa (Merged to form Kita District, Kagawa, Kita District) *March 16, 1899 Aya District, Kagawa, Aya (阿野郡) and Uta District, Kagawa, Uta (鵜足郡) Districts, Kagawa (Merged to form Ayauta District, Kagawa, Ayauta District) *March 16, 1899 Naka District, Kagawa, Naka (那珂郡) and Tado District, Kagawa, Tado (多度郡) Districts, Kagawa (Merged to form Nakatado District, Kagawa, Nakatado District) *March 16, 1899 Mino District, Kagawa, Mino (三野郡) and Toyota District, Kagawa, Toyota (豊田郡) Districts, Kagawa (Merged to form Mitoyo District, Kagawa, Mitoyo District) *April 1, 1900 Mashima District, Okayama, Mashima (真島郡), and Ōba District, Okayama, Ōba (大庭郡) Districts, Okayama Prefecture, Okayama (Merged to form Maniwa District, Okayama, Maniwa District) *April 1, 1900 Saisaijō District, Okayama, Saisaijō (西西条郡), Saihokujō District, Okayama, Saihokujō (西北条郡), Tōnanjō District, Okayama, Tōnanjō (東南条郡), and Tōhokujō District, Okayama, Tōhokujō (東北条郡) Districts, Okayama (Merged to form Tomata District, Okayama, Tomata District) *April 1, 1900 Shōboku District, Okayama, Shōboku (勝北郡) and Shōnan District, Okayama, Shōnan (勝南郡) Districts, Okayama (Merged to form Katsuta District, Okayama, Katsuta District) *April 1, 1900 Yoshino District, Okayama, Yoshino District (吉野郡), Okayama (Merged into Aida District, Okayama, Aida District) *April 1, 1900 Kumehokujō District, Okayama, Kumehokujō (久米北条郡) and Kumenanjō District, Okayama, Kumenanjō (久米南条郡), Okayama (Merged to form Kume District, Okayama, Kume District) *April 1, 1900 Mino District, Okayama, Mino (御野郡) and Tsudaka District, Okayama, Tsudaka (津高郡) Districts, Okayama (Merged to form Mitsu District, Okayama, Mitsu District) *April 1, 1900 Akasaka District, Okayama, Akasaka (赤坂郡) and Iwanashi District, Okayama, Iwanashi (磐梨郡) Districts, Okayama (Merged to form Akaiwa District, Okayama, Akaiwa District) *April 1, 1900 Tsuu District, Okayama, Tsuu (都宇郡) and Kuboya District, Okayama, Kuboya (窪屋郡) Districts, Okayama (Merged to form Tsukubo District, Okayama, Tsukubo District) *April 1, 1900 Kayō District, Okayama, Kayō (賀陽郡) and Shimotsumichi District, Okayama, Shimotsu (下道郡) Districts, Okayama (Merged to form Kibi District, Okayama, Kibi District) *April 1, 1900 Tetta District, Okayama, Tetta (哲多郡) and Aga District, Okayama, Aga (阿賀郡) Districts, Okayama (Merged to form Atetsu District, Okayama, Atetsu District) *April 1, 1906 Tōbui District, Hokkaido, Tōbui District (当縁郡), Hokkaido (The villages of Taiki (大樹村), Berufune (歴舟村), and parts of Tōbui (当縁村) merged with other villages to form the village of Moyori (茂寄村) in Hiroo District, Hokkaido, Hiroo District; parts of the village of Tōbui merged with other villages to form the village of Ōtsu (大津村) in Tokachi District, Hokkaido, Tokachi District)1912~1926
*April 4, 1913 Kaitō District, Aichi, Kaitō (海東郡) and Kaisai District, Aichi, Kaisai (海西郡), Aichi (Merged to form Ama District, Aichi, Ama District) *February 1, 1918 Muroran District, Hokkaido, 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, Hokkaido, Muroran)) *April 1923 Furebetsu District, Hokkaido, Furebetsu District (振別郡), Hokkaido (The village of Furebetsu (振別村) merged with other villages to form the village of Rubetsu, Hokkaido, Rubetsu in Etorofu District, Hokkaido, Etorofu) *April 1, 1925 Higashinari District, Osaka, Higashinari District (東成郡), Osaka (Merged into the city of Osaka) *April 1, 1925 Nishinari District, Osaka, Nishinari District (西成郡), Osaka (Merged into the city of Osaka)1927~1945
*April 1, 1931 Kii District, Kyoto, 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, Tokyo, 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, Tokyo, 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, Kanagawa, 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, Kanagawa, 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, Kanagawa, Kawasaki) *April 1, 1939 Tsuzuki District, Kanagawa, 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, Kanagawa, Kawasaki) *September 1, 1940 Otaru District, Hokkaido, Otaru District (小樽郡), Hokkaido (The village of Asari merged into the city of Otaru, Hokkaido, Otaru) *September 1, 1940 Takashima District, Hokkaido, Takashima District (高島郡), Hokkaido (The town of Takashima merged into the city of Otaru, Hokkaido, Otaru)1945~1959
*April 1, 1948 Kadono District, Kyoto, Kadono District (葛野郡), Kyoto (The villages of 小野郷 and 中川 merged into the Kyoto, city of Kyoto) *June 1, 1948 Kamakura District, Kanagawa, Kamakura District (鎌倉郡), Kanagawa (The town of 大船 merged into the Kamakura, Kanagawa, city of Kamakura) *September 10, 1948 Kiku District, Fukuoka, Kiku District (企救郡), Fukuoka (The village of 東谷 merged into the city of Kokura (now the Kitakyūshū, Fukuoka, city of Kitakyūshū)) *April 1, 1949 Otagi District, Kyoto, Otagi District (愛宕郡), Kyoto (The villages of 雲ヶ畑, 岩倉, 八瀬, 大原, 静市野, 鞍馬, 花背, and 久多 merged into the Kyoto, city of Kyoto) *April 1, 1950 Kitakanra District, Gunma, Kitakanra District (北甘楽郡), Gunma (Renamed to Kanra District, Gunma, Kanra District) *January 1, 1951 Akashi District, Hyōgo, Akashi District (明石郡), Hyōgo (The town of 大久保 and the village of 魚住 merged into the Akashi, Hyōgo, city of Akashi) *March 1, 1951 Uji District, Kyoto, Uji District (宇治郡), Kyoto (The town of Higashiuji merged with the towns and villages from Kuse District and granted town status to form the Uji, Kyoto, city of Uji) *April 1, 1954 Himi District, Toyama, Himi District (氷見郡), Toyama (The villages of 神代, 仏生寺, 布勢, 十二町, 速川, 久目, 阿尾, 薮田, 宇波, and 女良 merged into the Himi, Toyama, city of Himi) *April 1, 1954 Muko District, Hyōgo, Muko District (武庫郡), Hyōgo (The village of 良元 merged into the Takarazuka, Hyōgo, city of Takarazuka) *April 1, 1954 Ano District, Shimane, Ano District (安濃郡), Shimane (The villages of 佐比売, 朝山, and 富山 split and merged into the Ōda, Shimane, city of Ōda and the town of Tagi, Hikawa District, Shimane, Hikawa District (now the Izumo, Shimane, city of Izumo)) *October 17, 1954 Nishiyamanashi District, Yamanashi, Nishiyamanashi District (西山梨郡), Yamanashi (The villages of 山城, 住吉, 朝井, 玉諸, 甲運, 能泉, and 千代田 merged into the Kōfu, Yamanashi, city of Kōfu) *January 15, 1955 Utasutsu District, Hokkaido, Utasutsu District (歌棄郡), Hokkaido (The village of Utasutsu merged into the Suttsu, Hokkaido, town of Suttsu, Suttsu District, Hokkaido, Suttsu District; the village of Neppu merged with the village of Kuromatsunai and parts of the village of Tarukishi from Suttsu District to form the village of Sanwa (now the Kuromatsunai, Hokkaido, town of Kuromatsunai)) *January 15, 1955 Tsuruga District, Fukui, Tsuruga District (敦賀郡), Fukui Prefecture, Fukui (The villages of 東浦, 東郷, 中郷, 愛発, and 粟野 merged into the Tsuruga, Fukui, city of Tsuruga) *April 1, 1955 Futoru District, Hokkaido, Futoru District (太櫓郡), Hokkaido (The village of Futoru merged with the town of Tōsetana, Setana District, Hokkaido, Setana District to form the Kitahiyama, Hokkaido, town of Kitahiyama) *September 30, 1956 Bikuni District, Hokkaido, Bikuni District (美国郡), Hokkaido (The town of Bikuni merged into the Shakotan, Hokkaido, town of Shakotan, Shakotan District, Hokkaido, Shakotan District) *September 30, 1956 Yana District, Aichi, Yana District (八名郡), Aichi (The village of Yamayoshida merged into the Hōrai, Aichi, town of Hōrai, Minamishitara District, Aichi, Minamishitara District) *September 30, 1956 Kawage District, Mie, Kawage (河芸郡) and Ano District, Mie, Ano (安濃郡) Districts, Mie (Merged to form Age District, Mie, Age District) *September 30, 1956 Ikaruga District, Kyoto, Ikaruga District (何鹿郡), Kyoto (The village of Saga split and merged into the cities of Ayabe, Kyoto, Ayabe and Fukuchiyama, Kyoto, Fukuchiyama) *March 21, 1957 Minamimurayama District, Yamagata, Minamimurayama District (南村山郡), Yamagata (The village of Yamamoto merged into the Kaminoyama, Yamagata, city of Kaminoyama) *August 1, 1957 Nemuro District, Hokkaido, Nemuro District (根室郡), Hokkaido (The town of Nemuro and the village of Wada merged to form the Nemuro, Hokkaido, city of Nemuro) *March 31, 1958 Minamikatsuragi District (南葛城郡), Nara (The town of Gose and the villages of Kuzu, Taishō, and Katsujō merged and granted city status to form the Gose, Nara, city of Gose) *April 1, 1958 Oshiyoro District, Hokkaido, Oshiyoro District (忍路郡), Hokkaido (The village of Shioya merged into the Otaru, Hokkaido, city of Otaru) *April 1, 1958 Minamiokitama District, Yamagata, Minamiokitama District (南置賜郡), Yamagata (The village of Nakatsugawa merged into the Iide, Yamagata, town of Iide, Nishiokitama District, Yamagata, Nishiokitama District) *July 1, 1958 Arima District, Hyōgo, Arima District (有馬郡), Hyōgo (The town of Sanda granted city status to become the Sanda, Hyōgo, city of Sanda) *October 1, 1958 Nakakawachi District, Osaka, Nakakawachi District (中河内郡), Osaka (The town of Kashiwara granted city status to become the Kashiwara, Osaka, city of Kashiwara) *November 3, 1958 Esashi District, Iwate, Esashi District (江刺郡), Iwate (The town of Esashi granted city status to become the Esashi, Iwate, city of Esashi) *January 1, 1959 Uchi District, Nara, Uchi District (宇智郡), Nara (The village of Minamiuchi merged into the Gojō, Nara, city of Gojō) *April 1, 1959 Hanasaki District, Hokkaido, Hanasaki District (花咲郡), Hokkaido (The village of Habomai merged into the Nemuro, Hokkaido, city of Nemuro) *April 1, 1959 Nii District, Ehime, Nii District (新居郡), Ehime (The town of Sumino merged into the Niihama, Ehime, city of Niihama) *September 30, 1959 Minamikuwada District, Kyoto, Minamikuwada District (南桑田郡), Kyoto (The village of merged into the Kameoka, Kyoto, city of Kameoka)1960~1988
*October 1, 1962 Ashikaga District (足利郡), Tochigi (The towns of Mikuriya and Sakanishi merged into the city of Ashikaga, Tochigi, Ashikaga) *April 1, 1963 Inaba District, Gifu, Inaba District (稲葉郡), Gifu (The towns of Sohara, Naka, Inaha, and Unuma merged to form the city of Kakamigahara, Gifu, Kakamigahara) *May 1, 1965 Asaka District, Fukushima, 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, Fukushima, 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, Fukushima, Iwaki) *January 1, 1967 Chiba District, Chiba, Chiba District (千葉郡), Chiba (The town of Yachiyo gained city status to become the city of Yachiyo, Chiba, Yachiyo) *April 1, 1967 Kasai District, Hyōgo, Kasai District (加西郡), Hyōgo (The towns of Hōjō, Kasai, and Izumi merged to form the city of Kasai, Hyōgo, Kasai) *October 1, 1967 Ichihara District, Chiba, Ichihara District (市原郡), Chiba (The town of Nansō and the village of Kamo merged into the city of Ichihara, Chiba, Ichihara) *May 1, 1968 Nishichikuma District, Nagano, Nishichikuma District (西筑摩郡), Nagano (Renamed to Kiso District, Nagano, Kiso District (木曽郡)) *October 1, 1968 Shinobu District, Fukushima, Shinobu District (信夫郡), Fukushima (The town of Azuma merged into the city of Fukushima, Fukushima, 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, Shizuoka, Shizuoka) *April 1, 1969 Suki District, Shimane, Suki (周吉郡), Ōchi (Oki) District, Shimane, Ōchi District (穏地郡), Ama District, Shimane, Ama (海士郡), and Chibu District, Shimane, Chibu (知夫郡) Districts, Shimane (Merged to form Oki District, Shimane, Oki District) *August 1, 1970 Yoribetsu District, Hokkaido, Yoribetsu District (幌別郡), Hokkaido (The town of Noboribetsu gained city status to become the city of Noboribetsu, Hokkaido, Noboribetsu) *November 1, 1970 Chitose District, Hokkaido, Chitose District (千歳郡), Hokkaido (The town of Eniwa gained city status to become the city of Eniwa, Hokkaido, Eniwa) *November 3, 1970 Kitatama District, Tokyo, Kitatama District (北多摩郡), Tokyo (The town of Murayama gained city status to become the city of Musashimurayama, Tokyo, Musashimurayama) *December 1, 1970 Higashikasugai District, Aichi, Higashikasugai District (東春日井郡), Aichi (The town of Asahi gained city status to become the city of Owariasahi, Aichi, Owariasahi) *December 1, 1970 Hekikai District, Aichi, Hekikai District (碧海郡), Aichi (The town of Takahama gained town status to become the city of Takahama, Aichi, Takahama, the town of Chiryū gained city status to become the city of Chiryū, Aichi, Chiryū) *May 1, 1971 Jōdo District, Okayama, Jōdō District (上道郡), Okayama (The town of Jōdō merged into the city of Okayama, Okayama, Okayama) *November 1, 1971 Minamitama District, Tokyo, Minamitama District (南多摩郡), Tokyo (The town of Tama gained city status to become the city of Tama, Tokyo, Tama and the town of Inagi gained city status to become the city of Inagi, Tokyo, Inagi) *November 3, 1971 Kitakawachi District, Osaka, Kitakawachi District (北河内郡), Osaka (The town of Katano gained city status to become the city of Katano, Osaka, Katano) *April 1, 1972 Soo District (囎唹郡), Kagoshima (renamed to Soo District (曽於郡)) *March 20, 1973 Asa District, Hiroshima, Asa District (安佐郡), Hiroshima (The towns of Yasufuruichi, Satō, and Kōyō merged into the city of Hiroshima, Hiroshima, Hiroshima) *March 1, 1975 Sawara District, Fukuoka, Sawara District (早良郡), Fukuoka (The town of Sawara, Fukuoka, Sawara merged into the city of Fukuoka, Fukuoka, Fukuoka) *February 1, 1979 Innan District, Hyōgo, Innan District (印南郡), Hyōgo (The town of Shikata merged into the city of Kakogawa, Hyōgo, Kakogawa) *March 1, 1988 Natori District, Miyagi, Natori District (名取郡), Miyagi Prefecture, Miyagi (The town of Akiu merged into the city of Sendai, Miyagi, Sendai)1989~1998
*February 1, 1991 Hōtaku District, Kumamoto, Hōtaku District (飽託郡), Kumamoto (The towns of Hokubu, Kumamoto, Hokubu, Kawachi, Kumamoto, Kawachi, Akita, Kumamoto, Akita, and Tenmei, Kumamoto, Tenmei merged into the city of Kumamoto, Kumamoto, Kumamoto) *April 1, 1991 Kimitsu District, Chiba, Kimitsu District (君津郡), Chiba (The town of Sodegaura gained city status to become the city of Sodegaura, Chiba, Sodegaura) *September 1, 1996 Sapporo District, Hokkaido, Sapporo District (札幌郡), Hokkaido (The town of Hiroshima gained city status to become the city of Kitahiroshima, Hokkaido, Kitahiroshima)1999~2004
*April 1, 1999 Taki District, Hyōgo, Taki District (多紀郡), Hyōgo (The towns of Sasayama, Nishiki, Tannan, and Konda merged to form the city of Sasayama, Hyōgo, Sasayama) *October 1, 2001 Kurita District, Shiga, Kurita District (栗太郡), Shiga (The town of Rittō gained city status to become the city of Rittō, Shiga, Rittō) *February 3, 2003 Ashina District, Hiroshima, Ashina District (芦品郡), Hiroshima (The town of Shinichi merged into the city of Fukuyama, Hiroshima, Fukuyama) *April 1, 2003 Yamagata District, Gifu, 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, Gifu, Yamagata) *April 1, 2003 Ōkawa District, Kagawa, Ōkawa District (大川郡), Kagawa (The towns of Hiketa, Shirotori, and Ōchi merged to form the city of Higashikagawa, Kagawa, Higashikagawa) *April 21, 2003 Tsuno District, Yamaguchi, 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, Yamaguchi, Shūnan) *March 1, 2004 Sado District (佐渡郡), Niigata (the towns of Aikawa, Niigata, Aikawa, Kanai, Niigata, Kanai, Sawata, Niigata, Sawata, Hatano, Niigata, Hatano, Mano, Niigata, Mano, Hamochi, Niigata, Hamochi and Ogi, Niigata, Ogi; and the villages of Niibo, Niigata, Niibo, and Akadomari, Niigata, Akadomari merged with the city of Ryōtsu to form the city of Sado, Niigata, Sado) *March 1, 2004 Gujō District, Gifu, 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, Gifu, Gujō) *March 1, 2004 Mashita District, Gifu, 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, Gifu, Gero) *March 1, 2004 Takata District, Hiroshima, Takata District (高田郡), Hiroshima (The towns of Yoshida, Yachiyo, Midori, Takamiya, Kōda, and Mukaihara merged to form the city of Akitakata, Hiroshima, Akitakata) *March 1, 2004 Iki District, Nagasaki, Iki District (壱岐郡), Nagasaki (The towns of Gōnoura, Katsumoto, Ashibe, and Ishida merged to form the city of Iki, Nagasaki, Iki) *March 1, 2004 Shimoagata District, Nagasaki, 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, Nagasaki, Tsushima) *March 1, 2004 Kamiagata District, Nagasaki, 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, Nagasaki, Tsushima) *April 1, 2004 Naka District, Kyoto, Naka District (中郡), Kyoto (The towns of Mineyama and Ōmiya and other 2 districts 4 towns merged to form the city of Kyōtango, Kyoto, Kyōtango) *April 1, 2004 Takeno District, Kyoto, 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, Kyoto, Kyōtango) *April 1, 2004 Kumano District, Kyoto, Kumano District (熊野郡), Kyoto (The town of Kumihama and the other 2 districts 5 towns merged to form the city of Kyōtango, Kyoto, Kyōtango) *April 1, 2004 Yabu District, Hyōgo, Yabu District (養父郡), Hyōgo (The towns of Yōka, Yabu, Ōya, and Sekinomiya merged to form the city of Yabu, Hyōgo, Yabu) *April 1, 2004 Futami District, Hiroshima, 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, Hiroshima, Miyoshi) *April 1, 2004 Uma District, Ehime, 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, Ehime, Shikokuchūō) *April 1, 2004 Higashiuwa District, Ehime, 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, Ehime, 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, Mie, Shima) *October 1, 2004 Yasu District, Shiga, Yasu District (野洲郡), Shiga (The towns of Chūzu and Yasu merged to form the city of Yasu, Shiga, Yasu) *October 1, 2004 Kōka District, Shiga, Kōka District (甲賀郡), Shiga (The towns of Ishibe and Kosei merged to form the city of Konan, Shiga, Konan; The towns of Minakuchi, Tsuchiyama, Kōka, Kōnan, and Shigaraki merged to form the city of Kōka, Shiga, Kōka) *October 1, 2004 Nogi District, Shimane, Nogi District (能義郡), Shimane (The towns of Hirose and Hakuta merged with the city of Yasugi to form the city of Yasugi, Shimane, Yasugi) *October 1, 2004 Kawakami District, Okayama, 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, Okayama, Takahashi) *October 1, 2004 Oe District, Tokushima, Oe District (麻植郡), Tokushima Prefecture, Tokushima (The towns of Kamoshima, Kawashima, Yamakawa, and the village of Misato merged to form the city of Yoshinogawa, Tokushima, Yoshinogawa) *November 1, 2004 Kitaaizu District, Fukushima, Kitaaizu District (北会津郡), Fukushima (The village of Kitaaizu merged into the city of Aizuwakamatsu, Fukushima, Aizuwakamatsu) *November 1, 2004 Taga District, Ibaraki, Taga District (多賀郡), Ibaraki (The town of Jūō merged into the city of Hitachi, Ibaraki, Hitachi) *November 1, 2004 Higashitonami District, Toyama, Higashitonami District (東礪波郡), Toyama (The town of Shogawa and the city of Tonami merged to form the city of Tonami, Toyama, 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, Toyama, 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, Mie, 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, Hyōgo, Hikami District (氷上郡), Hyōgo (The towns of Kaibara, Hikami, Aogaki, Kasuga, Sannan, and Ichijima merged to form the city of Tamba, Hyōgo, Tamba) *November 1, 2004 Ketaka District (気高郡), Tottori (The towns of Ketaka, Shikano, and Aoya merged into the city of Tottori, Tottori, Tottori) *November 1, 2004 Mino District, Shimane, Mino District (美濃郡), Shimane (The towns of Mito and Hikimi merged into the city of Masuda, Shimane, Masuda) *November 1, 2004 Ohara District, Shimane, 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, Shimane, Unnan) *November 1, 2004 Oku District, Okayama, Oku District (邑久郡), Okayama (The towns of Ushimado, Oku, and Osafune merged to form the city of Setouchi, Okayama, Setouchi) *November 1, 2004 Shūsō District, Ehime, 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, Ehime, Saijō)2005
;January 1, 2005 *Sarashina District, Nagano, Sarashina District (更級郡), Nagano (The village of Ooka merged into the city of Nagano, Nagano, Nagano) * Iinan District (飯南郡), Mie (The towns of Iinan and Iitaka merged with the city of Matsusaka and two towns from Ichishi District to form the city of Matsusaka, Mie, Matsusaka) *Takashima District, Shiga, Takashima District (高島郡), Shiga (The towns of Adogawa, Imazu, Shinasahi, Takashima, Makino, and the village of Kutsuki merged to form the city of Takashima, Shiga, Takashima) *Onsen District, Ehime, Onsen District (温泉郡), Ehime (The town of Nakajima merged into the city of Matsuyama, Ehime, Matsuyama) *Kitaamabe District, Ōita, Kitaamabe District (北海部郡), Ōita (The town of Saganoseki, Ōita, Saganoseki merged into the city of Ōita, Ōita, Ōita) ;January 11, 2005 * Kawabe District (河辺郡), Akita (The towns of Kawabe and merged into the city of Akita, Akita, Akita) *Suzuka District, Mie, Suzuka District (鈴鹿郡), Mie (The town of Seki and the city of Kameyama merged to form the city of Kameyama, Mie, Kameyama) *Mihara District, Hyōgo, Mihara District (三原郡), Hyōgo (The towns of Midori, Seidan, Mihara, and Nandan merged to form the city of Minamiawaji, Hyōgo, Minamiawaji) *Uto District, Kumamoto, 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, Kumamoto, Uki) ;February 1, 2005 *Yoshiki District, Gifu, Yoshiki District (吉城郡), Gifu (The town of Kokufu and the village of Kamitakara merged into the city of Takayama, Gifu, Takayama) *Numakuma District, Hiroshima, Numakuma District (沼隈郡), Hiroshima (The town of Numakuma merged into the city of Fukuyama, Hiroshima, Fukuyama) ;February 7, 2005 *Mugi District, Gifu, 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, Gifu, Seki) ;February 13, 2005 *Ena District, Gifu, 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, Gifu, Nakatsugawa) *Toyoura District, Yamaguchi, 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, Yamaguchi, Shimonoseki) ;February 28, 2005 *Aso District, Tochigi, Aso District (安蘇郡), Tochigi (The towns Kuzu and Tanuma merged with the city of Sano to form the city of Sano, Tochigi, Sano) ;March 1, 2005 *Fugeshi District, Ishikawa, Fugeshi (鳳至郡) and Suzu District, Ishikawa, Suzu (珠洲郡) Districts, Ishikawa Prefecture, Ishikawa (Merged to form Hōsu District, Ishikawa, Hōsu District) *Shitsuki District, Okayama, Shitsuki District (後月郡), Okayama (The town of Yoshii merged into the city of Ibara, Okayama, Ibara) *Ogi District, Saga, Ogi District (小城郡), Saga (The towns of Ogi, Ashikari, Ushizu, and Mikatsuki merged to form the city of Ogi, Saga, Ogi) *Kitatakaki District, Nagasaki, 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, Nagasaki, Isahaya) *Shimoge District, Ōita, Shimoge District (下毛郡), Ōita (The towns of Honyabakei, Yabakei, Yamakuni, and the village of Sankō merged into the city of Nakatsu, Ōita, Nakatsu) ;March 3, 2005 *Minamiamabe District, Ōita, 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, Ōita, Saiki) ;March 19, 2005 *Nishikubiki District, Niigata, Nishikubiki District (西頸城郡), Niigata (The towns of Nose and Oume and the city of Itoigawa merged to form the city of Itoigawa, Niigata, Itoigawa) ;March 20, 2005 * Ukiha District (浮羽郡), Fukuoka (The towns of Ukiha and Yoshii merged to form the city of Ukiha, Fukuoka, Ukiha) ;March 22, 2005 *Kojima District, Okayama, Kojima District (児島郡), Okayama (The town of Nadasaki merged into the city of Okayama, Okayama, Okayama) *Kamo District, Hiroshima, 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, Hiroshima, Mihara) *Asa District, Yamaguchi, 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, Yamaguchi, San'yō-Onoda) *Ōtsu District, Yamaguchi, 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, Yamaguchi, Nagato) *Hita District, Ōita, 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, Ōita, Hita) ;March 28, 2005 * Higashikatsushika District (東葛飾郡), Chiba (The town of Shonan merged into the city of Kashiwa, Chiba, Kashiwa) *Kaizu District, Gifu, Kaizu District (海津郡), Gifu (The towns of Hirata, Nanno, and Kaizu merged to form the city of Kaizu, Gifu, Kaizu) *Mitsugi District, Hiroshima, Mitsugi District (御調郡), Hiroshima (The town of Mitsugi and Mukaishima merged into the city of Onomichi, Hiroshima, Onomichi) *Munakata District, Fukuoka, Munakata District (宗像郡), Fukuoka (The village of Ōshima merged into the city of Munakata, Fukuoka, Munakata) ;March 31, 2005 *Atetsu District, Okayama, 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, Okayama, Niimi) *Jōbō District, Okayama, 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, Okayama, Maniwa) *Kōnu District, Hiroshima, 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, Hiroshima, Shōbara) *Hiba District, Hiroshima, 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, Ōita, Usa District (宇佐郡), Ōita (The towns of Innai and Ajimu merged with the city of Usa to form the city of Usa, Ōita, Usa) *Ōno District, Ōita, 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, Ōita, Bungo-ōno) ;April 1, 2005 *Kurihara District, Miyagi, 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, Miyagi, Kurihara) *Tome District, Miyagi, 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, Miyagi, Tome) *Monou District, Miyagi, Monou District (桃生郡), Miyagi (The towns of Yamoto and Naruse merged to form the city of Higashimatsushima, Miyagi, 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, Miyagi, Ishinomaki) *Koshi District, Niigata, Koshi District (古志郡), Niigata (The village of Yamakoshi merged into the city of Nagaoka, Niigata, Nagaoka) *Higashikubiki District, Niigata, 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, Niigata, Tōkamachi) *Nakakubiki District, Niigata, 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, Niigata, Myōkō) *Kaminiikawa District, Toyama, 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, Toyama, Toyama) *Nei District, 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, Shizuoka, Kakegawa) *Haguri District, Aichi, Haguri District (葉栗郡), Aichi (The town of Kisogawa merged into the city of Ichinomiya, Aichi, Ichinomiya) *Nakashima District, Aichi, Nakashima District (中島郡), Aichi (The towns of Sofue and Heiwa merged into the city of Inazawa, Aichi, Inazawa) *Higashikamo District, Aichi, 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, Aichi, Toyota) *Asago District, Hyōgo, Asago District (朝来郡), Hyōgo (The towns of Ikuno, Wadayama, Santo, and Asago merged to form the city of Asago, Hyōgo, Asago) *Kinosaki District, Hyōgo, 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, Hyōgo, Toyooka; the town of Kasumi merged with the towns of Muraoka and Mikata from Mikata District to form the town of Kami, Hyōgo (Mikata), Kami in Mikata District, Hyōgo, Mikata District) *Izushi District, Hyōgo, 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, Nara, Soekami District (添上郡), Nara (The village of Tsukigase merged into the city of Nara, Nara, Nara) *Awa District, Tokushima, 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, Tokushima, Awa) *Naoiri District, Ōita, 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, Ōita, Taketa) ;July 1, 2005 *Kaijo District, Chiba, 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, Chiba, Asahi) * Inasa District (引佐郡), Shizuoka (The towns of Inasa, Hosoe, and Mikkabi merged into the city of Hamamatsu, Shizuoka, 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 *Kibi District, Okayama, Kibi District (吉備郡), Okayama (The town of Mabi merged into the city of Kurashiki, Okayama, Kurashiki) ;September 2, 2005 *Namegata District, Ibaraki, Namegata District (行方郡), Ibaraki (The towns of Asou, Kitaura, and Tamatsukuri merged to form the city of Namegata, Ibaraki, Namegata) ;October 1, 2005 *Atsuta District, Hokkaido, Atsuta District (厚田郡), Hokkaido (The village of Atsuta merged into the city of Ishikari, Hokkaido, Ishikari) *Hamamasu District, Hokkaido, Hamamasu District (浜益郡), Hokkaido (The village of Hamamasu merged into the city of Ishikari, Hokkaido, Ishikari) *Hiraka District, Akita, 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, Akita, Yokote) *Yuri District, Akita, Yuri District (由利郡), Akita (The towns of Nikaho, Konoura, and Kisakata merged to form the city of Nikaho, Akita, Nikaho) *Nishitagawa District, Yamagata, 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, Yamagata, Tsuruoka) *Makabe District, Ibaraki, 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, Ibaraki, Sakuragawa) *Enuma District, Ishikawa, Enuma District (江沼郡), Ishikawa (The town of Yamanaka merged with the city of Kaga to form the city of Kaga, Ishikawa, Kaga) *Minamiazumi District, Nagano, 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, Nagano, Azumino) *Minamishitara District, Aichi, 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, Aichi, Shinshiro) *Atsumi District, Aichi, Atsumi District (渥美郡), Aichi (The town of Atsumi merged into the city of Tahara, Aichi, Tahara) *Sakata District, Shiga, Sakata District (坂田郡), Shiga (The town of Ōmi merged into the city of Maibara, Shiga, Maibara) *Naka District, Shimane, 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, Shimane, Hamada) *Nima District, Shimane, Nima District (邇摩郡), Shimane (The towns of Yunotsu and Nima merged with the city of Ōda to form the city of Ōda, Shimane, Ōda) *Saba District, Yamaguchi, 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, Yamaguchi, Yamaguchi) *Yoshiki District, 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, Ōita, 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, Kitsuki) *Ōita District, Ōita, Ōita District (大分郡), Ōita (The towns of Yufuin, Shōnai, and Hasama merged to form the city of Yufu, Ōita, Yufu) ;October 11, 2005 *Kashima District, Ibaraki, 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, Ibaraki, Hokota) ;October 24, 2005 *Mino District, Hyōgo, Mino District (美嚢郡), Hyōgo (The town of Yokawa merged into the city of Miki, Hyōgo, Miki) ;November 1, 2005 *Higashiyamanashi District, Yamanashi, 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, Yamanashi, Kōshū) *Imizu District, Toyama, 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, Toyama, Imizu) *Nishitonami District, Toyama, Nishitonami District (西礪波郡), Toyama (The town of Fukuoka merged with the city of Takaoka to form the city of Takaoka, Toyama, Takaoka) ;November 3, 2005 *Saeki District, Hiroshima, Saeki District (佐伯郡), Hiroshima (The towns of Ōno and Miyajima merged into the city of Hatsukaichi, Hiroshima, Hatsukaichi) ;November 7, 2005 *Ōno District, Fukui, Ōno District (大野郡), Fukui (The village of Izumi merged into the city of Ōno, Fukui, 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, Kagoshima, Minamisatsuma)2006~
;January 1, 2006 *Hienuki District, Iwate, 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, Iwate, Hanamaki) *Nakakanbara District, Niigata, Nakakanbara District (中蒲原郡), Niigata (The town of Muramatsu merged with the city of Gosen to form the city of Gosen, Niigata, Gosen) *Age District, Mie, 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, Mie, Tsu) *Ichishi District, Mie, 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, Mie, Tsu) *Kanzaki District, Shiga, Kanzaki District (神崎郡), Shiga (The town of Notogawa merged into the city of Higashiōmi, Shiga, Higashiōmi) *Amata District, Kyoto, Amata District (天田郡), Kyoto (The towns of Miwa and Yakuno merged into the city of Fukuchiyama, Kyoto, Fukuchiyama) *Kasa District, Kyoto, Kasa District (加佐郡), Kyoto (The town of Ōe merged into the city of Fukuchiyama) *Kitakuwada District, Kyoto, Kitakuwada District (北桑田郡), Kyoto (The town of Miyama merged with 3 towns from Funai District to form the city of Nantan, Kyoto, Nantan) *Mitoyo District, Kagawa, Mitoyo District (三豊郡), Kagawa (The towns of Takase, Yamamoto, Mino, Toyonaka, Takuma, Nio, and Saita merged to form the city of Mitoyo, Kagawa, Mitoyo) ;January 23, 2006 *Toki District, Gifu, Toki District (土岐郡), Gifu (The town of Kasahara merged into the city of Tajimi, Gifu, Tajimi) ;February 1, 2006 *Asuwa District, Fukui, Asuwa District (足羽郡), Fukui (The town of Miyama merged into the city of Fukui, Fukui, Fukui) ;February 11, 2006 *Tsuna District, Hyōgo, Tsuna District (津名郡), Hyōgo (The town of Goshiki merged with the city of Sumoto to form the city of Sumoto, Hyōgo, Sumoto) ;March 1, 2006 *Fukayasu District, Hiroshima, Fukayasu District (深安郡), Hiroshima (The town of Kannabe merged into the city of Fukuyama, Hiroshima, Fukuyama) *Kami District, Kōchi, Kami District (香美郡), Kōchi Prefecture, Kōchi (The towns of Tosayamada and Kahoku and the village of Monobe merged to form the city of Kami, Kōchi, Kami; the towns of Akaoka, Kagami, Noichi, and Yasu and the village of Yoshikawa merged to form the city of Kōnan, Kōchi, Kōnan) ;March 3, 2006 *Onyū District, Fukui, 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, Fukui, Ōi in Ōi District) ;March 15, 2006 *Kitakoma District, Yamanashi, Kitakoma District (北巨摩郡), Yamanashi (The town of Kobuchisawa merged into the city of Hokuto, Yamanashi, Hokuto) ;March 18, 2006 *Usui District, Gunma, Usui District (碓氷郡), Gunma (The town of Matsuida merged with the city of Annaka to form the city of Annaka, Gunma, Annaka) ;March 19, 2006 *Nishiibaraki District, Ibaraki, 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, Ibaraki, Kasama) ;March 20, 2006 *Sakai District, Fukui, Sakai District (坂井郡), Fukui (The towns of Sakai, Mikuni, Maruoka, and Harue merged to form the city of Sakai, Fukui, Sakai) *Shiga District, Shiga, Shiga District (滋賀郡), Shiga (The town of Shiga merged into the city of Ōtsu, Shiga, Ōtsu) *Katō District, Hyōgo, Katō District (加東郡), Hyōgo (The towns of Yashiro, Takino, and Tōjō merged to form the city of Katō, Hyōgo, Katō) ;March 27, 2006 *Niihari District, Ibaraki, 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, Ibaraki, Omitama) *Tsukuba District, Ibaraki, Tsukuba District (筑波郡), Ibaraki (The town of Ina and the village of Yawara merged to form the city of Tsukubamirai, Ibaraki, Tsukubamirai) *Nitta District, Gunma, 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, Gunma, Midori) *Yamada District, Gunma, 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, Chiba, 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, Chiba, Yokoshibahikari in Sanbu District) *Shisō District, Hyōgo, Shisō District (宍粟郡), Hyōgo (The town of Yasutomi merged into the city of Himeji, Hyōgo, Himeji) *Shikama District, Hyōgo, Shikama District (飾磨郡), Hyōgo (The towns of Ieshima and Yumesaki merged into the city of Himeji) ;March 31, 2006 *Shizunai District, Hokkaido, Shizunai (静内郡) and Mitsuishi District, Hokkaido, Mitsuishi (三石郡) Districts, Hokkaido (Merged to form Hidaka District, Hokkaido, Hidaka District (日高郡)) *Shida District, Miyagi, 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, Miyagi, Ōsaki) *Tamatsukuri District, Miyagi, 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, Nagasaki, 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, Nagasaki, Minamishimabara) ;April 1, 2006 *Naga District, Wakayama, Naga District (那賀郡), Wakayama (The town of Iwade gained city status to become the city of Iwade, Wakayama, Iwade) ;August 1, 2006 *Higashiyatsushiro District, Yamanashi, Higashiyatsushiro District (東八代郡), Yamanashi (The village of Ashigawa merged into the city of Fuefuki, Yamanashi, Fuefuki) ;October 1, 2006 * Gunma District (群馬郡), Gunma (The town of Haruna merged into the city of Takasaki, Gunma, Takasaki) ;January 22, 2007 *Mitsu District, Okayama, Mitsu District (御津郡), Okayama (The town of Takebe merged into the city of Okayama, Okayama, Okayama) *Akaiwa District, Okayama, Akaiwa District (赤磐郡), Okayama (The town of Seto merged into the city of Okayama) ;January 29, 2007 *Yamato District, Fukuoka, 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, Fukuoka, Miyama) *Miike District, Fukuoka, 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, Fukuoka, Miyama) ;March 11, 2007 *Tsukui District, Kanagawa, Tsukui District (津久井郡), Kanagawa (The towns of Shiroyama and Fujino merged into the city of Sagamihara, Kanagawa, Sagamihara) ;October 1, 2007 *Saga District, Saga, Saga District (佐賀郡), Saga (The towns of Kawasoe, Kubota, and Higashiyoga merged into the city of Saga, Saga, Saga) ;December 1, 2007 *Kawanabe District, Kagoshima, 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, Kagoshima, 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, Yamaguchi, Mine District (美祢郡), Yamaguchi (The towns of Mitō and Shūhō merged with the city of Mine to form the city of Mine, Yamaguchi, Mine) ;November 1, 2008 *Ihara District, Shizuoka, Ihara District (庵原郡), Shizuoka (The town of Yui merged into the city of Shizuoka, Shizuoka, Shizuoka, the town of Fujikawa merged into the city of Fuji, Shizuoka, Fuji) * Isa District (伊佐郡), Kagoshima (The town of Hishikari merged with the city of Ōkuchi to form the city of Isa, Kagoshima, Isa) ;January 1, 2009 * Shida District (志太郡), Shizuoka (The town of Okabe merged into the Fujieda, Shizuoka, city of Fujieda) ;March 30, 2009 *Minaminaka District, Miyazaki, Minaminaka District (南那珂郡), Miyazaki (The towns of Kitagō and Nangō merged with the city of Nichinan to form the Nichinan, Miyazaki, city of Nichinan) ;May 5, 2009 * Seta District (勢多郡), Gunma (The village of Fujimi merged into the city of Maebashi, Gunma, Maebashi) ;January 1, 2010 *Higashiazai District, Shiga, Higashiazai District (東浅井郡), Shiga (The towns of Torahime and Kohoku merged into the city of Nagahama, Shiga, Nagahama) *Ika District, Shiga, Ika District (伊香郡), Shiga (The towns of Takatsuki, Kinomoto, Yogo, and Nishiazai merged into the city of Nagahama, Shiga, Nagahama) * Itoshima District (糸島郡), Fukuoka (The towns of Nijō and Shima merged with the city of Maebaru to form the city of Itoshima, Fukuoka, Itoshima) ;January 4, 2010 *Nishikamo District, Aichi, Nishikamo District (西加茂郡), Aichi (The town of Miyoshi become the city of Miyoshi, Aichi, Miyoshi) ;February 1, 2010 *Hoi District, Aichi, Hoi District (宝飯郡), Aichi (The town of Kozakai merged into the city of Toyokawa, Aichi, Toyokawa) ;March 23, 2010 *Kitasaitama District, Saitama, Kitasaitama District (北埼玉郡), Saitama (The towns of Kisai, Kitakawabe, and Ōtone merged with the city of Kazo to form the Kazo, Saitama, city of Kazo) *Fuji District, Shizuoka, Fuji District (富士郡), Shizuoka (The town of Shibakawa merged into the Fujinomiya, Shizuoka, city of Fujinomiya) * Hamana District (浜名郡), Shizuoka (The town of Arai merged into the Kosai, Shizuoka, city of Kosai) *Kamoto District, Kumamoto, Kamoto District (鹿本郡), Kumamoto (The town of Ueki merged into the Kumamoto, Kumamoto, city of Kumamoto) *Miyazaki District, Miyazaki, Miyazaki District (宮崎郡), Miyazaki (The town of Kiyotake merged into the Miyazaki, Miyazaki, city of Miyazaki) ;March 31, 2010 *Kitauonuma District, Niigata, Kitauonuma District (北魚沼郡), Niigata (The town of Kawaguchi merged into the Nagaoka, Niigata, city of Nagaoka) ;April 1, 2011 *Hazu District, Aichi, Hazu District (幡豆郡), Aichi (The towns of Hazu, Isshiki and Kira merged into the Nishio, Aichi, city of Nishio) ;August 1, 2011 *Yatsuka District, Shimane, Yatsuka District (八束郡), Shimane (The town of Higashiizumo merged into the Matsue, Shimane, city of Matsue) ;September 26, 2011 *Higashiiwai District, Iwate, Higashiiwai District (東磐井郡), Iwate (The town of Fujisawa merged into the Ichinoseki, Iwate, city of Ichinoseki) ;October 1, 2011 *Kamitsuga District, Tochigi, Kamitsuga District (上都賀郡), Tochigi (The town of Nishikata merged into the Tochigi, Tochigi, city of Tochigi) *Hikawa District, Shimane, Hikawa District (簸川郡), Shimane (The town of Hikawa merged into the Izumo, Shimane, city of Izumo) ;November 11, 2011 *Ishikawa District, Ishikawa, Ishikawa District (石川郡), Ishikawa (The town of Nonoichi, Ishikawa, Nonoichi become the city of Nonoichi) ;October 1, 2018 * Chikushi District (筑紫郡), Fukuoka (The town of Nakagawa, Fukuoka, Nakagawa become the city of Nakagawa)See also
* List of dissolved municipalities of Japan {{DEFAULTSORT:Dissolved Districts Of Japan Former districts of Japan, *