Kumamoto's 2021 population is now estimated at 741,455. In 1950, the population of Kumamoto was 195,000. Kumamoto has grown by -1,157 since 2015, which represents a -0.16% 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.