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.