Philadelphia's 2021 population is now estimated at 5,733,578. In 1950, the population of Philadelphia was 3,127,806. Philadelphia has grown by 16,814 since 2015, which represents a 0.29% 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 Philadelphia, which typically includes Philadelphia's population in addition to adjacent suburban areas.