Hillah's 2025 population is now estimated at 673,103. In 1950, the population of Hillah was 40,712. Hillah has grown by 16,585 in the last year, which represents a 2.53% 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.