(糸島郡), Fukuoka (The towns of Nijō and Shima merged with the city of Maebaru to form the city of Itoshima) January 4, 2010 Nishikamo District (西加茂郡), Aichi (The town of Miyoshi become the city of Miyoshi) February 1, 2010 Hoi District (宝飯郡), Aichi (The town of Kozakai merged into the city of Toyokawa) March 23, 2010 Kitasaitama District (北埼玉郡), Saitama (The towns of Kisai, Kitakawabe, and Ōtone merged with the city of Kazo to form the city of Kazo) Fuji District (富士郡), Shizuoka (The town of Shibakawa merged into the city of Fujinomiya) Hamana District (浜名郡), Shizuoka (The town of Arai merged into the city of Kosai) Kamoto District (鹿本郡), Kumamoto (The town of Ueki merged into the city of Kumamoto) Miyazaki District (宮崎郡), Miyazaki (The town of Kiyotake merged into the city of Miyazaki) March 31, 2010 Kitauonuma District (北魚沼郡), Niigata (The town of Kawaguchi merged into the city of Nagaoka) April 1, 2011 Hazu District (幡豆郡), Aichi (The towns of Hazu, Isshiki and Kira merged into the city of Nishio) August 1, 2011 Yatsuka District (八束郡), Shimane (The town of Higashiizumo merged into the city of Matsue) September 26, 2011 Higashiiwai District (東磐井郡), Iwate (The town of Fujisawa merged into the city of Ichinoseki) October 1, 2011 Kamitsuga District (上都賀郡), Tochigi (The town of Nishikata merged into the city of Tochigi) Hikawa District (簸川郡), Shimane (The town of Hikawa merged into the city of Izumo) November 11, 2011 Ishikawa District (石川郡), Ishikawa (The town of Nonoichi become the city of Nonoichi) October 1, 2018 Chikushi District (筑紫郡), Fukuoka (The town of Nakagawa become the city of Nakagawa) See also List of dissolved municipalities of Japan