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Sado (佐渡市, Sado-shi) is a city located on Sado Island (佐渡島, Sado-shima/Sado-ga-shima) in Niigata Prefecture, Japan. Since 2004, the city has comprised the entire island, although not all of its total area is urbanized. Sado is the sixth largest island of Japan in area following the four main islands and Okinawa Island (excluding the Northern Territories).
As of May 1, 2017, the city has an estimated population of 55,474, and a population density of 64.8 persons per km2. The total area is 855.26 km2.