Zentsūji is a city located in Kagawa Prefecture, Japan. As of 1 October 2022, the city had an estimated population of 30,780 in 13096 house…Zentsūji is a city located in Kagawa Prefecture, Japan. As of 1 October 2022, the city had an estimated population of 30,780 in 13096 households and a population density of 770 persons per km. The total area of the city is 39.93 square kilometres.