Vembayam is a village in Nedumangad tehsil in district of Thiruvananthapuram, Kerala, India. As per the data provided by Census of India in 2011, total population of Vembayam was 20,716 which includes 9,905 males and 10,811 females. Vembayam covers 1562 ha area. Pincode of Vembayam is 695615.