Nagai is a city located in Yamagata Prefecture, Japan. As of 1 February 2020, the city had an estimated population of 26,466 in 9940 househ…Nagai is a city located in Yamagata Prefecture, Japan. As of 1 February 2020, the city had an estimated population of 26,466 in 9940 households, and a population density of 120 people per km². The total area of the city is 214.67 square kilometres.
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