As of 2011[update] India census,[2] Kelamangalam had a population of 11,052. Males constitute 51% of the population and females 49%. Kelamangalam has an average literacy rate of 61%, higher than the national average of 59.5%: male literacy is 67%, and female literacy is 55%. In Kelamangalam, 15% of the population is under 6 years of age.