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On April 1, 2005, Yamakoshi, along with the town of Oguni (from Kariwa District), the town of Nakanoshima (from Minamikanbara District), and the towns of Koshiji and Mishima (both from Santō District), was merged into the expanded city of Nagaoka.
On October 23, 2004, Yamakoshi was hit by the 2004 Chūetsu earthquake.
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