Kalasin's 2021 population is now estimated at 524,519. In 1950, the population of Kalasin was 8,095. Kalasin has grown by 6,884 since 2015, which represents a 1.33% 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 Kalasin, which typically includes Kalasin's population in addition to adjacent suburban areas.