Koshi (古志郡, Koshi-gun) was a district located in Niigata Prefecture, Japan.
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As of 2003, the district had an estimated population of 2,035 and a density of 51.09 persons per km². The total area is 39.83 km².
Towns and villages
Merger and dissolution
References
Koshi District, Niigata Wikipedia(Text) CC BY-SA