Kōnan is a city located in Kōchi Prefecture, Japan. As of 30 June 2022, the city had an estimated population of 33,076 in 15350 households and …Kōnan is a city located in Kōchi Prefecture, Japan. As of 30 June 2022, the city had an estimated population of 33,076 in 15350 households and a population density of 49 persons per km. The total area of the city is 126.46 square kilometres.