Beihai's 2025 population is now estimated at 515,400. In 1950, the population of Beihai was 72,930. Beihai has grown by 6,955 in the last year, which represents a 1.37% 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 Beihai, which typically includes Beihai's population in addition to adjacent suburban areas.