Hillah's 2021 population is now estimated at 615,167. In 1950, the population of Hillah was 40,712. Hillah has grown by 11,018 since 2015, which represents a 1.82% 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 Hillah, which typically includes Hillah's population in addition to adjacent suburban areas.