Kollayil is a village in Neyyattinkara tehsil in district of Thiruvananthapuram, Kerala, India. As per the data provided by Census of India in 2011, total population of Kollayil was 25,428 which includes 12,404 males and 13,024 females. Kollayil covers 1373 ha area. Pincode of Kollayil is 695122.