Santō District, Niigata
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- Before the Edo Period, Santō District was part of the now-defunct Koshi District.
- On April 1, 2005 the towns of Koshiji and Mishima merged into the city of Nagaoka.
- On January 1, 2006 the towns of Teradomari and Yoita, and the village of Washima were also merged into Nagaoka.