As of 2001[update] India census, Kadamakkudy islands had a population of 15,823. Males constitute 49% of the population and females 51%. Kadamakkudy has an average literacy rate of 84%, higher than the national average of 59.5%: male literacy is 86%, and female literacy is 82%. In Kadamakkudy islands, 11% of the population is under 6 years of age.
Valiya Kadamakudy is the main island of ((Kadamakkudy Islands)).