Kumamoto's 2023 population is now estimated at 738,415. In 1950, the population of Kumamoto was 195,000. Kumamoto has grown by -1,652 in the last year, which represents a -0.22% annual change. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Kumamoto, which typically includes Kumamoto's population in addition to adjacent suburban areas.