Sendai's 2025 population is now estimated at 2,337,590. In 1950, the population of Sendai was 537,571. Sendai experienced a decrease of -3,840 residents over the past year, marking an annual decline of -0.16%.These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Sendai, which typically includes Sendai's population in addition to adjacent suburban areas.