List of mergers in Nagasaki Prefecture

Mergers from April 1, 1999 to Present

• On March 1, 2004 - the towns of Izuhara, Mitsushima and Toyotama, and the towns of Kamiagata, Kamitsushima and Mine were merged to create the city of Tsushima. Shimoagata District and Kamiagata District were dissolved as a result of this merger.
• On March 1, 2004 - the towns of Ashibe, Gonoura, Ishida and Katsumoto were merged to create the city of Iki. Iki District was dissolved as a result of this merger.
• On August 1, 2004 - the city of Fukue was merged with the towns of Kishiku, Miiraku, Naru, Tamanoura and Tomie to create the city of Gotō.
• On August 1, 2004 - the towns of Arikawa, Kamigotō, Narao, Shin'uonome and Wakamatsu were merged to create the town of Shinkamigotō.
• On January 4, 2005 - the towns of Iōjima, Kōyagi, Nomozaki, Sanwa, Sotome and Takashima, were merged into the expanded city of Nagasaki.
• On March 1, 2005 - the old city of Isahaya absorbed the town of Tarami, and the towns of Iimori, Konagai, Moriyama and Takaki to create the new and expanded city of Isahaya. Kitatakaki District was dissolved as a result of this merger.
• On April 1, 2005 - the former town of Saikai absorbed the towns of Ōseto, Ōshima, Sakito and Seihi to create the city of Saikai.
• On April 1, 2005 - the towns of Sechibaru and Yoshii were merged into the expanded city of Sasebo.
• On October 1, 2005 - the old city of Hirado absorbed the towns of Ikitsuki and Tabira, and the village of Ōshima to create the new and expanded city of Hirado. With this merger, all villages in Nagasaki Prefecture have been dissolved.
• On October 11, 2005 - the towns of Aino, Azuma, Chijiwa, Kunimi, Minamikushiyama, Mizuho and Obama were merged to create the city of Unzen.
• On January 1, 2006 - the town of Ariake was merged into the expanded city of Shimabara.
• On January 1, 2006 - the old city of Matsuura absorbed the towns of Fukushima and Takashima to create the new and expanded city of Matsuura.
• On January 4, 2006 - the town of Kinkai was merged into the expanded city of Nagasaki.
• On March 31, 2006 - the towns of Kosaza and Uku were merged into the expanded city of Sasebo.
• On March 31, 2006 - the towns of Arie, Fukae, Futsu, Kazusa, Kitaarima, Kuchinotsu, Minamiarima and Nishiarie were merged to create the city of Minamishimabara. Minamitakaki District was dissolved as a result of this merger.
• On March 31, 2010 - the towns of Emukae and Shikamachi was merged into the expanded city of Sasebo.

  Planned/Future Mergers