Tōkai is a city located in Aichi Prefecture, Japan. As of 1 October 2019, the city had an estimated population of 113,698 in 51,035 household…Tōkai is a city located in Aichi Prefecture, Japan. As of 1 October 2019, the city had an estimated population of 113,698 in 51,035 households, and a population density of 2,618 persons per km². The total area of the city was 43.43 square kilometres.