Antsirabe's 2021 population is now estimated at 372,920. In 1950, the population of Antsirabe was 9,767. Antsirabe has grown by 17,088 since 2015, which represents a 4.80% 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 Antsirabe, which typically includes Antsirabe's population in addition to adjacent suburban areas.