Chengannur is a municipality in the Alappuzha district of Kerala, India. It is located 43 km (26.7 mi) south east of the district headquarters in Alappuzha and about 115 km (71.5 mi) north of the state capital Thiruvananthapuram. As per the 2011 Indian census, Chengannur has a population of 23,466 people, and a population density of 1,607/km2 (4,160/sq mi).