Longkou's 2021 population is now estimated at 535,497. In 1950, the population of Longkou was 3,124. Longkou has grown by 14,929 since 2015, which represents a 2.87% 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 Longkou, which typically includes Longkou's population in addition to adjacent suburban areas.