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At the time of enforcing the city status, the town of Toyama gained city status.
At the time of enforcing the town and village status, the district formed into 8 towns and 49 villages.
April 1, 1896 - 5 towns and 28 villages split and created Nakaniikawa District. (3 towns, 21 villages)
Recent mergers
On April 1, 2005 - The towns of Ōsawano and Ōyama, along with the towns of Fuchū and Yatsuo, and the villages of Hosoiri and Yamada (all from Nei District), were merged into the expanded city of Toyama.[1] Therefore, Kaminiikawa District and Nei District were dissolved as a result of this merger.
