Diwaniyah's 2021 population is now estimated at 532,961. In 1950, the population of Diwaniyah was 22,854. Diwaniyah has grown by 19,592 since 2015, which represents a 3.82% 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 Diwaniyah, which typically includes Diwaniyah's population in addition to adjacent suburban areas.