Tagami is a town located in Niigata Prefecture, Japan. As of 1 July 2019, the town had an estimated population of 11,481 across 4,203 househ…Tagami is a town located in Niigata Prefecture, Japan. As of 1 July 2019, the town had an estimated population of 11,481 across 4,203 households and a population density of 362 persons per km. The total area of the town was 31.71 square kilometres.