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On January 1, 2005, Ōshima, along with the town of Yasuzuka, the villages of Maki and Uragawara (all from Higashikubiki District), the towns of Itakura, Kakizaki, Ōgata and Yoshikawa, the villages of Kiyosato, Kubiki, Nakagō and Sanwa (all from Nakakubiki District), and the town of Nadachi (from Nishikubiki District), was merged into the expanded city of Jōetsu.
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