Sanuki is a city in Kagawa Prefecture, Japan. As of 1 September 2022, the city had an estimated population of 46,016 in 20847 households and …Sanuki is a city in Kagawa Prefecture, Japan. As of 1 September 2022, the city had an estimated population of 46,016 in 20847 households and a population density of and a population density of 290 persons per km². The total area of the city is 158.63 square kilometres.