Kamo is a city located in Niigata Prefecture, Japan. As of 1 July 2019, the city had an estimated population of 25,971 in 10,270 households, an…Kamo is a city located in Niigata Prefecture, Japan. As of 1 July 2019, the city had an estimated population of 25,971 in 10,270 households, and a population density of 194 persons per km. The total area of the city was 133.72 square kilometres.