Chittagong's 2025 population is now estimated at 5,653,490. In 1950, the population of Chittagong was 288,853. Chittagong has grown by 139,880 in the last year, which represents a 2.54% 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 Chittagong, which typically includes Chittagong's population in addition to adjacent suburban areas.