Shinshiro is a city located in Aichi Prefecture, Japan. As of 1 October 2019, the city had an estimated population of 44,581 in 17,691 house…Shinshiro is a city located in Aichi Prefecture, Japan. As of 1 October 2019, the city had an estimated population of 44,581 in 17,691 households, and a population density of 89.3 persons per km. The total area of the city is 499.23 square kilometres.