Kayamkulam is a municipality in the Alappuzha district of Kerala, India. It is located 46 km south of the district headquarters in Alappuzha and about 110 km north of the state capital Thiruvananthapuram. As per the 2011 Indian census, Kayamkulam has a population of 68,634 people, and a population density of 3,149/km2. Kayamkulam was the erstwhile capital of the Kingdom of Onattukara, and today continues to be the largest town in the Onattukara region.