Kottayam's 2021 population is now estimated at 739,212. In 1950, the population of Kottayam was 52,331. Kottayam has grown by 43,151 since 2015, which represents a 6.20% 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 Kottayam, which typically includes Kottayam's population in addition to adjacent suburban areas.