Thennilai is a village in Aravakurichi tehsil in district of Karur, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Thennilai was 3,485 which includes 1,716 males and 1,769 females. Thennilai covers 3241.63 ha area. Pincode of Thennilai is 639206.