List of mergers in Tokyo

Prefectural border changes

• 1871/72 – Abolition of feudal domains and first wave of prefectural mergers: Major parts of Shinagawa, Kosuge and Urawa Prefectures, covering the ancient Musashi Province Districts Ebara and Toshima and parts of Tama, Adachi and Katsushika become part of Tokyo.
• 1871/72 – The Setagaya exclave of Hikone Prefecture comprising 20 pre-modern Villages in the Ebara and Tama Districts is merged into Tokyo.
• 1878 – The Izu Islands are transferred from Shizuoka to Tokyo.
• 1880 – The Ogasawara Islands, previously under direct Home Ministry administration, are transferred to Tokyo.
• 1893 – The "three Tama" , North Tama, South Tama and West Tama – the three western sections of ancient Tama district, Musashi province – comprising 91 Towns and Villages are transferred from Kanagawa to Tokyo.
• 1907 – Hōya village in North Adachi district, Saitama is transferred to North Tama District, Tokyo.
• 1926 – The neighbourhood of Ukima from Yokozone Village , Saitama is transferred to Iwabuchi Town , Tokyo.
• 1958 – The majority of Moto-Sayama Village , Saitama is merged into Mizuho Town , Tokyo.

  District merger

• 1896 – The Districts East Tama and South Toshima are merged to form Toyotama District. The joint district government is set up in Yodobashi Town.

  Municipal mergers

• 1917 – Hachiōji Town became an City, leaving Minamitama District.
• 1920 – Naitō-Shinjuku Town from Toyotama district is merged into Tokyo City where it becomes part of Yotsuya Ward.
• 1932 – 82 towns and villages were merged into Tokyo City and consolidated into 20 new wards.
• 1936 – The villages of Kinuta and Chitose were merged into Tokyo City and integrated into Setagaya Ward.
• 1941 – Komiya town was merged into Hachiōji city.
• In 1943 - Tokyo City ' was abolished, and the government of the larger Tokyo Prefecture ', henceforth the Tokyo Metropolis ', assumed the direct administration of the former city. Since 1943, no city in Japan has had the name Tokyo.
• March 1947 - The 35 wards of former Tokyo city were consolidated into 22 wards.
• May 1947 – The 22 wards were transformed into quasi-municipal special wards.
• August 1947 – The special ward of Nerima was split off from Itabashi.
• 1955 – The villages of Hirai and Ōguno merged to establish Hinode village.
• 1955 – The villages of Yokoyama, Moto-Hachiōji, Ongata, Kawaguchi, Kasumi and Yui were merged into Hachiōji city.
• 1956 – The villages of Miyake, Tsubota and Ako merged to newly establish Miyake village.
• 1958 – Machida town and the villages of Tadao, Tsurukawa and Sakai merged to newly establish Machida city.
• 1959 – Asakawa village was merged into Hachiōji city.
• 1963 – Sunagawa town was merged into Tachikawa city.
• 1964 – Yugi village was merged into Hachiōji city.
• In 1995 - the city of Akiruno was established by the merger of the city of Akigawa and the town of Itsukaichi.
• On January 21, 2001 - the city of Nishi-Tōkyō''' was established by the merger of the cities of Hōya and Tanashi.

  Name changes

• 1928 – Chōfu village in Ebara county becomes a town and is renamed East Chōfu town, Kanagawa since 1889. North ', South ' and West Tama counties were transferred from Kanagawa to Tokyo in 1893, so that there were three different municipalities named "Chōfu"
• 1970 – Murayama town becomes a city and is renamed Musashi-Murayama city
• 1970 – Yamato town becomes a city and is renamed Higashi-Yamato-shi represents the Tō
• 1970 – Kurume town becomes a city and is renamed East Kurume city