Basilan City's 2021 population is now estimated at 548,445. In 1950, the population of Basilan City was 116,297. Basilan City has grown by 15,310 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 Basilan City, which typically includes Basilan City's population in addition to adjacent suburban areas.