Longhai's 2021 population is now estimated at 655,081. In 1950, the population of Longhai was 3,124. Longhai has grown by 23,878 since 2015, which represents a 3.78% 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.