Kollam's 2021 population is now estimated at 1,940,571. In 1950, the population of Kollam was 64,863. Kollam has grown by 89,013 since 2015, which represents a 4.81% 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 Kollam, which typically includes Kollam's population in addition to adjacent suburban areas.