Longhai's 2025 population is now estimated at 736,214. In 1950, the population of Longhai was 3,124. Longhai has grown by 17,548 in the last year, which represents a 2.44% 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 Longhai, which typically includes Longhai's population in addition to adjacent suburban areas.