Kayamkulam's 2025 population is now estimated at 838,870. In 1950, the population of Kayamkulam was 41,928. Kayamkulam has grown by 25,491 in the last year, which represents a 3.13% 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 Kayamkulam, which typically includes Kayamkulam's population in addition to adjacent suburban areas.