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The district started to shrink after the town of Nuttari merged with Niigata and the city continued to absorb the district. Three towns later gained city status during a 10-year period: Niitsu in 1951, Gosen in 1954 and Shirone (part of Niigata) in 1959.
District Timeline
On June 1, 1959 - The town of Shirone was elevated to city status to become the city of Shirone. (3 towns, 1 village)
On November 1, 1996 - The village of Yokogoshi was elevated to town status to become the town of Yokogoshi. (4 towns)
^住民基本台帳人口移動報告年報 [Annual Report on Population Movement in the Basic Resident Register] (in Japanese). 総務庁統計局. 2005. p. 139. 3月21日に白根市,豊栄市,小須戸町,横越町,亀田町,岩室村,西川町,味方村,潟東村,月潟村,中之口村及び新津市は新潟市に編入された。